How do i solve: 15 - w/4 = 28 (this is 2 step equations)

Step 1
- w/4 + 15 = 28
-15 -15 (1st)

(4) -w/4= 13(4) (2nd)
-w=52
Divide both side by -1 to isolate w and you get
W = -52 (Answer)

First we need to isolate the variable so we add 15 to both sides which is
w/4=43  then we need to multiply by 4 to both sides so its 4w=172
then divide by 4 which is 43 so the answer is w=43

The perimeter of a rectangle doesn't tell you its dimensions, so there are
an infinite number of different dimensions and different areas it could have
with the same perimeter.  I'm pretty sure there's some more information in
the part of the question that you skipped over before you started copying
the part that you posted.