Question: What is the solution?

Solve 0 = -19*s + 21*s + 6 for s.

Answer: -3

Question: What is the solution?

Solve 621*h + 10714 + 1802 = -3189 + 2664 for h.

Answer: -21

Question: What is the solution?

Solve 53*d + 70 = 39*d for d.

Answer: -5

Question: What is the solution?

Solve 567 = -3*q + 585 for q.

Answer:
6