Write down the solution for this math problem: Solve -16*l = -21*l - 20 for l.
answer: -4

Write down the solution for this math problem: Solve 0 = -5320*v + 4983*v + 18535 for v.
answer: 55

Write down the solution for this math problem: Solve -4724*b + 4808*b = -2786 + 434 for b.
answer: -28

Write down the solution for this math problem: Solve z + 1 = 5 for z.
answer:
4