Write down the solution for this math problem: Solve 512 = 1306*r - 13854 for r.
answer: 11

Write down the solution for this math problem: Solve -905 - 1263 - 366 = -181*q for q.
answer: 14

Write down the solution for this math problem: Solve 13615 - 14165 = -25*q for q.
answer: 22

Write down the solution for this math problem: Solve 2730 - 1047 = 99*k for k.
answer:
17