Question:
Solve 0 = 61*z - 5*z - 97 + 377 for z..

Answer:
-5

Question:
Solve 640 = -23*k + 4*k + 498 - 428 for k..

Answer:
-30

Question:
Solve 10*x - 7*x + 12 = 0 for x..

Answer:
-4

Question:
Solve 132 = -4*y - 29*y for y..

Answer:
-4