Question: What is the solution?

Solve 0 = -2125*x + 2140*x + 90 for x.

Answer: -6

Question: What is the solution?

Solve -2150 - 116245 = 2631*h for h.

Answer: -45

Question: What is the solution?

Solve -25 - 38 = 7*d for d.

Answer: -9

Question: What is the solution?

Solve 99*j - 4223 + 5177 = -7*j for j.

Answer:
-9