Write down the solution for this math problem: Solve -21*z + 27*z = 0 for z.
answer: 0

Write down the solution for this math problem: Solve -7*n + 44 - 65 = 0 for n.
answer: -3

Write down the solution for this math problem: Solve 678 + 3263 = 340*y - 139 for y.
answer: 12

Write down the solution for this math problem: Solve -37*i = -3416 + 3083 for i.
answer:
9