Write down the solution for this math problem: Solve 39 = 2*l + 33 for l.
answer: 3

Write down the solution for this math problem: Solve 0*i = 6*i + 3*i for i.
answer: 0

Write down the solution for this math problem: Solve 0 = -7*r + 28 - 7 for r.
answer: 3

Write down the solution for this math problem: Solve 457*b + 1133*b + 23939 = -30121 for b.
answer:
-34