Write down the solution for this math problem: Solve 515*j - 20 = 511*j for j.
answer: 5

Write down the solution for this math problem: Solve -9*l + 4*l + 15 = 0 for l.
answer: 3

Write down the solution for this math problem: Solve -154*z + 12 = -156*z for z.
answer: -6

Write down the solution for this math problem: Solve 28 = -4948*q + 4920*q for q.
answer:
-1