Solve 1775 = 18*r + 1811 for r.
Solve this plz.

A: -2

Solve 26353*u = 26310*u - 516 for u.
Solve this plz.

A: -12

Solve -620*o + 12700 - 62149 - 25788 = 189*o for o.
Solve this plz.

A:
-93