Question: What is the solution?

Solve 172*d = 728*d - 378 + 3158 for d.

Answer: -5

Question: What is the solution?

Solve -48 = 2*r - 36 for r.

Answer: -6

Question: What is the solution?

Solve -4833 = -154*h + 2713 for h.

Answer: 49

Question: What is the solution?

Solve -u = 78*u - 948 for u.

Answer:
12