Write down the solution for this math problem: Solve 61*r + 970 = -372 for r.
answer: -22

Write down the solution for this math problem: Solve 51*v + 1616*v = 143362 for v.
answer: 86

Write down the solution for this math problem: Solve -2168*z + 2160*z - 64 = 0 for z.
answer: -8

Write down the solution for this math problem: Solve -28*a = -27*a for a.
answer:
0