Question: What is the solution?

Solve 2*r + 2 = -10 - 12 for r.

Answer: -12

Question: What is the solution?

Solve -250*k + 5975 = 1975 for k.

Answer: 16

Question: What is the solution?

Solve 38*r - 9*r = 58 for r.

Answer: 2

Question: What is the solution?

Solve 65*q - 99 = 88*q - 559 for q.

Answer:
20