Question: What is the solution?

Solve 0 = 561*r - 559*r + 10 for r.

Answer: -5

Question: What is the solution?

Solve 0 = 63*x + 60*x - 45781 + 51562 for x.

Answer: -47

Question: What is the solution?

Solve -453*q + 16535 + 18580 = 1054*q - 16123 for q.

Answer: 34

Question: What is the solution?

Solve -642 = 95*k + 1077 + 2841 for k.

Answer:
-48