Write down the solution for this math problem: Solve -45 = -13*k + 28*k for k.
answer: -3

Write down the solution for this math problem: Solve 514*u + 4 = 515*u for u.
answer: 4

Write down the solution for this math problem: Solve 18 = x + 13 for x.
answer: 5

Write down the solution for this math problem: Solve 1760*i - 143 = 1773*i for i.
answer:
-11