Write down the solution for this math problem: Solve 0 = -402*v - 8560 - 686 for v.
answer: -23

Write down the solution for this math problem: Solve -12*f + 16*f + 4 = 0 for f.
answer: -1

Write down the solution for this math problem: Solve -1255*r + 2555*r + 91 = 1297*r - 14 for r.
answer: -35

Write down the solution for this math problem: Solve -990*o + 3450 = -2509 - 8891 for o.
answer:
15