Solve -3097840 + 3097147 = -99*a for a.
Solve this plz.

A: 7

Solve -2146*u = -99*u - 277*u - 171690 for u.
Solve this plz.

A: 97

Solve -270*k + 1725 = -1515 for k.
Solve this plz.

A:
12