Question: What is the solution?

Solve 20 = -2*s + 6*s for s.

Answer: 5

Question: What is the solution?

Solve 84*h = 14*h for h.

Answer: 0

Question: What is the solution?

Solve 5*t + 9 = -t - 3 for t.

Answer: -2

Question: What is the solution?

Solve 4*q + 87 = -2*q + 123 for q.

Answer:
6