Write down the solution for this math problem: Solve -1098*v + 971*v = -1397 for v.
answer: 11

Write down the solution for this math problem: Solve 2444*w = 2099*w + 7590 for w.
answer: 22

Write down the solution for this math problem: Solve 326*x - 6837 = -5485 + 16904 for x.
answer: 56

Write down the solution for this math problem: Solve 5*r - 136 = -146 for r.
answer:
-2