Write down the solution for this math problem: Solve o - 104 + 109 = 0 for o.
answer: -5

Write down the solution for this math problem: Solve 211*u = 199*u - 24 for u.
answer: -2

Write down the solution for this math problem: Solve 8*m - 12*m - 12 = 0 for m.
answer: -3

Write down the solution for this math problem: Solve 493*m + 427*m = 87*m for m.
answer:
0