Question: What is the solution?

Solve -113 = -83*u - 196 for u.

Answer: -1

Question: What is the solution?

Solve 28*r - 5208 = -4648 for r.

Answer: 20

Question: What is the solution?

Solve -12999 + 7614 = -52*i - 180*i + 8535 for i.

Answer: 60

Question: What is the solution?

Solve -14*k + 28*k = -28 for k.

Answer:
-2