Question: What is the solution?

Solve -7*a - 160 = a + 12*a for a.

Answer: -8

Question: What is the solution?

Solve 0 = -28*o + 40*o for o.

Answer: 0

Question: What is the solution?

Solve -243*y = 302*y + 376*y - 18420 for y.

Answer: 20

Question: What is the solution?

Solve -4*n = 7*n - 11 for n.

Answer:
1