Question: What is the solution?

Solve -13 = -23*h + 10 for h.

Answer: 1

Question: What is the solution?

Solve -15*f = 21*f + 72 for f.

Answer: -2

Question: What is the solution?

Solve -c - 27 + 19 = 0 for c.

Answer: -8

Question: What is the solution?

Solve -38*d + 42*d = 16 for d.

Answer:
4