Question: What is the solution?

Solve -18*q = -33*q + 16*q + 4 for q.

Answer: -4

Question: What is the solution?

Solve 0 = -13*o - 124*o - 959 for o.

Answer: -7

Question: What is the solution?

Solve -28494*a - 56 = -28549*a + 109 for a.

Answer: 3

Question: What is the solution?

Solve 673*r = 1127*r + 1816 for r.

Answer:
-4