Question:
Solve 0 = 9*v + 15*v - 5*v - 494 for v..

Answer:
26

Question:
Solve 44*d + 627 = -19*d - 801 - 210 for d..

Answer:
-26

Question:
Solve 120 = 98*k - 128*k for k..

Answer:
-4

Question:
Solve -690 = -6908*s + 6878*s for s..

Answer:
23