Question: What is the solution?

Solve -17 + 7 - 17 = 3*a for a.

Answer: -9

Question: What is the solution?

Solve 570*u - 582*u = -108 for u.

Answer: 9

Question: What is the solution?

Solve 0 = 836*d - 730 + 8254 for d.

Answer: -9

Question: What is the solution?

Solve -18 = 30*f - 14 + 26 for f.

Answer:
-1