Question:
Solve -504 = -4151*y + 4123*y for y..

Answer:
18

Question:
Solve -10*z - 32*z = 0 for z..

Answer:
0

Question:
Solve 95*v - 88*v = 28 for v..

Answer:
4

Question:
Solve 7*r - 75 + 91 = -33 for r..

Answer:
-7