Solve 12*w - 10*w = 4 for w.
Solve this plz.

A: 2

Solve 138*d - 2577 = 269*d - 1005 for d.
Solve this plz.

A: -12

Solve -95*w + 56*w + 507 = 0 for w.
Solve this plz.

A:
13