Question: What is the solution?

Solve -30*m + 9*m - 13*m = -238 for m.

Answer: 7

Question: What is the solution?

Solve 11*i - 52 - 58 = 22*i for i.

Answer: -10

Question: What is the solution?

Solve -8*d = -3*d - 0*d for d.

Answer: 0

Question: What is the solution?

Solve 86*d - 667*d - 14146 = 62*d for d.

Answer:
-22