Special Case Identified

algebraic_steps.py

@@ -37,8 +37,8 @@ def add_both_sides(equation, value):
     left_expr = parse_expr(left, transformations=transformations, evaluate=False)
     right_expr = parse_expr(right, transformations=transformations, evaluate=False)
     
-    new_left_expr = left_expr + value
+    new_left_expr = clean(left_expr + value)
-    new_right_expr = right_expr + value
+    new_right_expr = clean(right_expr + value)
     step["after"] = f"{sstr(new_left_expr)} = {sstr(new_right_expr)}"
     
     step["step"] = f"Add both sides by {sstr(value)}"

problem_generator.py

@@ -208,10 +208,14 @@ def generate_binomial ():
     #a(x + b) + c(x + d) = e
     ans = random.choice([i for i in range(-15, 16)])
     a = random.choice([i for i in range(-5, 6) if i != 0])
+    a = 4
     b = random.choice([i for i in range(-5, 6)])
+    b = 4
 
     c = random.choice([i for i in range(-5, 6) if i != 0 and i != -a])
+    c = 1
     d = random.choice([i for i in range(-5, 6)])
+    d = 5
     
     e = a * (ans + b) + c * (ans + d)
 

steps_generator.py

@@ -349,8 +349,10 @@ def generate_fraction_steps (problem):
 def generate_binomial_steps (problem):
     #a(x + b) + c(x + d) = e
     steps = []
+    x = symbols('x')
     current = problem["problem"]
     
+    ## Distribute Terms
     last_len = -1
     while last_len != len(steps):
         last_len = len(steps)
@@ -358,8 +360,29 @@ def generate_binomial_steps (problem):
         if len(steps):
             current = steps[-1]["after"]
     
+    ## Combine Like Terms
     steps.append(algebraic_steps.combine_like_terms(current))
     current = steps[-1]["after"]
+    left, right = current.split("=")
+    left_expr = parse_expr(left, transformations=transformations)
+    
+    ## Subtract constant
+    b = left_expr.subs(x, 0)
+    if b.is_zero == False:
+        if b.is_negative:
+            steps.append(algebraic_steps.add_both_sides(current, -b))
+        elif b.is_positive:
+            steps.append(algebraic_steps.subtract_both_sides(current, b))
+        current = steps[-1]["after"]
+        left, right = current.split("=")
+        left_expr = parse_expr(left, transformations=transformations)
+    
+    ## Divide by coefficient
+    a = left_expr.coeff(x)
+    if a != 1 and a != -1:
+        steps.append(algebraic_steps.divide_both_sides(current, a))
+    elif a == -1:
+        steps.append(algebraic_steps.multiply_both_sides(current, a))
     
     return steps