Write down the solution for this math problem: Solve 4*z = 19*z - 30 for z.
answer: 2

Write down the solution for this math problem: Solve 0 = -587*c + 102*c + 308*c - 2478 for c.
answer: -14

Write down the solution for this math problem: Solve 0 = -4*j + 256 - 248 for j.
answer: 2

Write down the solution for this math problem: Solve 5*j - 30 = -15 for j.
answer:
3