Question: What is the solution?

Solve -18*d - 40 = -10*d for d.

Answer: -5

Question: What is the solution?

Solve -54*o = 242*o - 995 - 3149 for o.

Answer: 14

Question: What is the solution?

Solve -13365 = 791*r - 2291 for r.

Answer: -14

Question: What is the solution?

Solve -3 = -222*c + 223*c for c.

Answer:
-3