Question:
Solve 0 = 2*x + x - 6 for x..

Answer:
2

Question:
Solve 435*u + 17424 = 39*u for u..

Answer:
-44

Question:
Solve -79*p = -81*p - 4 for p..

Answer:
-2

Question:
Solve -13554 + 8170 = -2692*x for x..

Answer:
2