Solve -2457 + 5290 = -87*s + 2050 for s.
Solve this plz.

A: -9

Solve -1108*a - 12292 + 21994 = -15782 for a.
Solve this plz.

A: 23

Solve 9*v = 10*v + 3 for v.
Solve this plz.

A:
-3