Solve 3551*o + 7144 = 1570*o + 1887*o for o.
Solve this plz.

A: -76

Solve -1039 = 69*u + 239 + 309 for u.
Solve this plz.

A: -23

Solve 0 = -7*k + 3*k - 8 for k.
Solve this plz.

A:
-2