Write down the solution for this math problem: Solve 1897*o - 7083 = 556*o + 15714 for o.
answer: 17

Write down the solution for this math problem: Solve -10*b = -12*b - 10 for b.
answer: -5

Write down the solution for this math problem: Solve 0 = 16*r + 5431 - 5191 for r.
answer: -15

Write down the solution for this math problem: Solve 17*d + 5 - 39 = 0 for d.
answer:
2