Question: What is the solution?

Solve 20*a + 122*a = -64*a - 1854 for a.

Answer: -9

Question: What is the solution?

Solve -4566*o - 26191 = 256209 + 96578 for o.

Answer: -83

Question: What is the solution?

Solve -4*f + 37*f - 23*f = 70 for f.

Answer: 7

Question: What is the solution?

Solve 0 = 2687*n - 2666*n - 147 for n.

Answer:
7