Write down the solution for this math problem: Solve 0 = -11*z + 14*z + 6 for z.
answer: -2

Write down the solution for this math problem: Solve 2*o + 326 = -30*o + 390 for o.
answer: 2

Write down the solution for this math problem: Solve -2603 + 2792 = -21*b for b.
answer: -9

Write down the solution for this math problem: Solve 4*a + 250 + 751 = 147*a for a.
answer:
7