Write down the solution for this math problem: Solve -109*a = -211*a + 121*a - 171 for a.
answer: 9

Write down the solution for this math problem: Solve 0 = 518*b + 172*b + 2233 + 2308 + 2359 for b.
answer: -10

Write down the solution for this math problem: Solve 299*p - 258*p = 175*p + 252*p + 262*p for p.
answer: 0

Write down the solution for this math problem: Solve 12*a + 36 + 142 = 58 for a.
answer:
-10