Question:
Solve 2602 = 407*u - 3095 - 815 for u..

Answer:
16

Question:
Solve -186*v - 1729 - 2309 = 224 + 9502 for v..

Answer:
-74

Question:
Solve 124*r - 14489 + 145 = 776*r for r..

Answer:
-22

Question:
Solve -35*q + 45*q = 50 for q..

Answer:
5