Question: What is the solution?

Solve 19*r + 30 + 27 = 0 for r.

Answer: -3

Question: What is the solution?

Solve 813*s + 174497 + 56250 = -233*s - 861*s for s.

Answer: -121

Question: What is the solution?

Solve -13*q = -4*q - 9 for q.

Answer: 1

Question: What is the solution?

Solve -2929*i - 230770 = 2779*i - 1283*i + 485*i for i.

Answer:
-47