Question: What is the solution?

Solve -3 = -8*s + 21 for s.

Answer: 3

Question: What is the solution?

Solve d = 74 - 77 for d.

Answer: -3

Question: What is the solution?

Solve -45*a + 0*a - 872 = 747 - 899 for a.

Answer: -16

Question: What is the solution?

Solve -g + 472 - 466 = 0 for g.

Answer:
6