Question:
Solve 27*z - 32*z = 30 for z..

Answer:
-6

Question:
Solve 175*z + 357 = 248 - 1116 for z..

Answer:
-7

Question:
Solve -616 = 29*a + 48*a for a..

Answer:
-8

Question:
Solve 231 = 32*w + 487 for w..

Answer:
-8