Write down the solution for this math problem: Solve -466*k = 1219*k - 101*k + 1781*k + 77395 for k.
answer: -23

Write down the solution for this math problem: Solve 31*o - 20 = 35*o for o.
answer: -5

Write down the solution for this math problem: Solve 1695*r + 375 = 1720*r for r.
answer: 15

Write down the solution for this math problem: Solve 0 = -45*x - 42*x - 261 for x.
answer:
-3