Write down the solution for this math problem: Solve 0 = -46*d + 201*d - 111 - 819 for d.
answer: 6

Write down the solution for this math problem: Solve 38*r = 29917 - 31019 for r.
answer: -29

Write down the solution for this math problem: Solve 18350*o - 17425*o + 3700 = 0 for o.
answer: -4

Write down the solution for this math problem: Solve -r = -37*r + 252 for r.
answer:
7