Question: What is the solution?

Solve 378*o = -4173*o + 86469 for o.

Answer: 19

Question: What is the solution?

Solve -31 = 2*q - 27 for q.

Answer: -2

Question: What is the solution?

Solve -537310 = -22787*r + 3249*r - 2623460 - 317024 for r.

Answer: -123

Question: What is the solution?

Solve 20*w - 324 = -524 for w.

Answer:
-10