Question: What is the solution?

Solve 49*z = 45*z - 16 for z.

Answer: -4

Question: What is the solution?

Solve 969*f + 89*f = 167*f - 6237 for f.

Answer: -7

Question: What is the solution?

Solve -246*j + 239*j = 1 + 62 for j.

Answer: -9

Question: What is the solution?

Solve 6 = -6*h - 6 for h.

Answer:
-2