Question: What is the solution?

Solve -3210*d + 1833*d + 7432*d + 790942 = -3142*d for d.

Answer: -86

Question: What is the solution?

Solve 204*o + 237*o - 67125 + 109863 = -397*o for o.

Answer: -51

Question: What is the solution?

Solve -28*r = -31*r + 9 for r.

Answer: 3

Question: What is the solution?

Solve -12203*s + 13 = -12190*s for s.

Answer:
1