Question: What is the solution?

Solve -11*r = -13*r - 6 for r.

Answer: -3

Question: What is the solution?

Solve -11499 = -189*b - 13767 for b.

Answer: -12

Question: What is the solution?

Solve 134041*d - 134012*d - 638 = 0 for d.

Answer: 22

Question: What is the solution?

Solve 1071*n - 1204 = -1151*n - 1161*n + 3555*n for n.

Answer:
-7