Question: What is the solution?

Solve 0 = -p - 35 + 30 for p.

Answer: -5

Question: What is the solution?

Solve -5*f + 50*f + 111 = -69 for f.

Answer: -4

Question: What is the solution?

Solve 12*s + 18 = 3*s for s.

Answer: -2

Question: What is the solution?

Solve 90*q + 13 - 283 = 0 for q.

Answer:
3