Write down the solution for this math problem: Solve -20 + 53 = -11*n for n.
answer: -3

Write down the solution for this math problem: Solve -6*n = -27 + 9 for n.
answer: 3

Write down the solution for this math problem: Solve 2303 = -1038*r - 271*r + 1356*r for r.
answer: 49

Write down the solution for this math problem: Solve 6*o = -o + 28 for o.
answer:
4