Solve 0 = 7*s + 1023 - 981 for s.
Solve this plz.

A: -6

Solve -73*u - 2820 = 3*u - 217*u for u.
Solve this plz.

A: 20

Solve -2132*a + 5760 = 2127*a - 4139*a for a.
Solve this plz.

A:
48