Write down the solution for this math problem: Solve 21*b + 52 = 23*b + 54 for b.
answer: -1

Write down the solution for this math problem: Solve 3547 - 44 = 64*a + 49*a for a.
answer: 31

Write down the solution for this math problem: Solve -139*z = 51 + 1061 for z.
answer: -8

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