Write down the solution for this math problem: Solve -663*u - 12900 - 8745 + 2592 + 2478 = 0 for u.
answer: -25

Write down the solution for this math problem: Solve -4 = -11*r - 15 for r.
answer: -1

Write down the solution for this math problem: Solve 229*y + 1046 = -115*y + 358 for y.
answer: -2

Write down the solution for this math problem: Solve 52*v + 26*v + 3 = -153 for v.
answer:
-2