Question: What is the solution?

Solve 5*c + 13 = -2 for c.

Answer: -3

Question: What is the solution?

Solve 293433 = -16*a + 292681 for a.

Answer: -47

Question: What is the solution?

Solve -211 + 406 + 423 = -160*x - 22 for x.

Answer: -4

Question: What is the solution?

Solve 35*a = -18*a - 23*a - 2128 for a.

Answer:
-28