Question: What is the solution?

Solve -8*r - 36 = -2*r for r.

Answer: -6

Question: What is the solution?

Solve -1167*x + 1158*x + 54 = 0 for x.

Answer: 6

Question: What is the solution?

Solve -43 = -54*l + 119*l + 542 for l.

Answer: -9

Question: What is the solution?

Solve 8*v + 39 - 15 = 0 for v.

Answer:
-3