Write down the solution for this math problem: Solve -24 = -13*j + 21*j for j.
answer: -3

Write down the solution for this math problem: Solve -297 = 110*w + 803 for w.
answer: -10

Write down the solution for this math problem: Solve -7210*o + 7225*o = -30 for o.
answer: -2

Write down the solution for this math problem: Solve 78*n + 450 = 28*n for n.
answer:
-9