Write down the solution for this math problem: Solve -521*v + 522*v = 0 for v.
answer: 0

Write down the solution for this math problem: Solve 68 = r + 64 for r.
answer: 4

Write down the solution for this math problem: Solve 57*t - 30 = 47*t for t.
answer: 3

Write down the solution for this math problem: Solve 11*h = -10 - 1 for h.
answer:
-1