Write down the solution for this math problem: Solve 138*z - 137*z + 608 = 77*z for z.
answer: 8

Write down the solution for this math problem: Solve 28*a - 11*a = -31*a - 1248 for a.
answer: -26

Write down the solution for this math problem: Solve 58 - 63 = -5*z for z.
answer: 1

Write down the solution for this math problem: Solve -7905*a + 15830*a = 7897*a + 1036 for a.
answer:
37