Question: What is the solution?

Solve -9*d + 12 = -86*d - 65 for d.

Answer: -1

Question: What is the solution?

Solve -88*o - 3137 + 4467 = -3598 for o.

Answer: 56

Question: What is the solution?

Solve 40 = -3*d + 11*d for d.

Answer: 5

Question: What is the solution?

Solve -1512 = 58*x + 194*x for x.

Answer:
-6