Question:
Solve y = 12 - 12 for y..

Answer:
0

Question:
Solve -13*q - 91*q - 8360 = -234*q + 42*q for q..

Answer:
95

Question:
Solve -56 = 89*v - 81*v for v..

Answer:
-7

Question:
Solve 161*w = -157*w + 321*w - 78 for w..

Answer:
26