Question: What is the solution?

Solve -17*c + 20 = -13*c for c.

Answer: 5

Question: What is the solution?

Solve -42 = -2*p - 1 - 5 for p.

Answer: 18

Question: What is the solution?

Solve -958*q + 1211*q = -1689*q - 1348*q - 9870 for q.

Answer: -3

Question: What is the solution?

Solve -3*q - 10 = -q for q.

Answer:
-5