Question: What is the solution?

Solve -741 = 18*s - 10*s + 49*s for s.

Answer: -13

Question: What is the solution?

Solve -12*f - 62*f - 630 = -29*f for f.

Answer: -14

Question: What is the solution?

Solve 1223*k - 1230*k - 35 = 0 for k.

Answer: -5

Question: What is the solution?

Solve 0 = -q + 166 - 169 for q.

Answer:
-3