Solve 1807 = -1853*k + 447 - 2431 + 85 for k.
Solve this plz.

A: -2

Solve -464*i - 2371 + 7216 = -3507 for i.
Solve this plz.

A: 18

Solve -3*u = 517*u + 4*u - 24104 for u.
Solve this plz.

A:
46