Write down the solution for this math problem: Solve 7862*s = 7838*s + 480 for s.
answer: 20

Write down the solution for this math problem: Solve 163*l - 243*l + 6804 = 172*l for l.
answer: 27

Write down the solution for this math problem: Solve 159*r - 137*r = -44 for r.
answer: -2

Write down the solution for this math problem: Solve 388*y - 71 = 33 - 9416 for y.
answer:
-24