4/5w-12=2/3w

what is the step by step answer to those equation?

Kulay, there is no such thing as a "step by step answer" here. You seem to want a "step by step solution."

I must assume that by 4/5 you actually meant (4/5) and that by 2/3 you meant (2/3). Then your equation becomes:

(4/5) w - 12 = (2/3) w.

The LCD here is 5*3, or 15, so mult. every term by 15:

12w - 180 = 10w.

Add 180 to both sides, obtaining 12 w - 180 + 180 = 10w + 180.

Then 12w = 10w + 180. Simplifying, 2w = 180. What is w?