Question: What is the solution?

Solve 10 - 8 = -2*a for a.

Answer: -1

Question: What is the solution?

Solve 0 = 538*y - 530*y + 176 for y.

Answer: -22

Question: What is the solution?

Solve -3*o + 400 = 97*o for o.

Answer: 4

Question: What is the solution?

Solve 0 = -1044*o + 1570*o - 8942 for o.

Answer:
17