Write down the solution for this math problem: Solve -9*n = -n for n.
answer: 0

Write down the solution for this math problem: Solve 0 = -7*s + 3*s + 4 for s.
answer: 1

Write down the solution for this math problem: Solve 12*l - 12843 = -12795 for l.
answer: 4

Write down the solution for this math problem: Solve -402467 + 403250 = -29*l for l.
answer:
-27