Question: What is the solution?

Solve -459*r + 852*r = 410*r + 884 for r.

Answer: -52

Question: What is the solution?

Solve -43*n + 37*n + 18 = 0 for n.

Answer: 3

Question: What is the solution?

Solve -1428*k + 622*k + 669*k - 959 = 0 for k.

Answer: -7

Question: What is the solution?

Solve 9*a - 891 - 864 = -11*a - 19*a for a.

Answer:
45