Question: What is the solution?

Solve -14 + 528 = 25*d - 36 for d.

Answer: 22

Question: What is the solution?

Solve 39*k = 193 - 1090 for k.

Answer: -23

Question: What is the solution?

Solve 540 = 13*v + 371 for v.

Answer: 13

Question: What is the solution?

Solve 12 = -12*r + 36 for r.

Answer:
2