Question: What is the solution?

Solve -309 = 36*k + 292 - 133 for k.

Answer: -13

Question: What is the solution?

Solve -11*m + 0 = -22 for m.

Answer: 2

Question: What is the solution?

Solve 80*x + 90*x + 423 = -1107 for x.

Answer: -9

Question: What is the solution?

Solve -192 - 368 - 121 = 681*m for m.

Answer:
-1