Write down the solution for this math problem: Solve -9*k + 58 = 40 for k.
answer: 2

Write down the solution for this math problem: Solve 8*g - 12698 + 12786 = -14*g for g.
answer: -4

Write down the solution for this math problem: Solve -66*f - 359*f - 7650 = 0 for f.
answer: -18

Write down the solution for this math problem: Solve 15*d - 9*d + 4*d + 90 = 0 for d.
answer:
-9