Write down the solution for this math problem: Solve 105 = 7002*r - 6995*r for r.
answer: 15

Write down the solution for this math problem: Solve 126 = -9*f + 72 for f.
answer: -6

Write down the solution for this math problem: Solve -10211*v = -10219*v + 56 for v.
answer: 7

Write down the solution for this math problem: Solve 5*w + 14 - 9 = 0 for w.
answer:
-1