Solve 73*u + u - 5*u + 4134 = -9*u for u.
Solve this plz.

A: -53

Solve -7*a = 30 - 9 for a.
Solve this plz.

A: -3

Solve 537*k + 232*k = 148 + 621 for k.
Solve this plz.

A:
1