Question

Solve for L.
P = 2L + 2W

Answer 1

(P-2W)/2=L
this is the answer

Answer 2

(P-2W)/2=L

Explanation:

In this case, you have three incognita, you can't put a number on any of them if you don't know the real value.

The only thing you can do here is to let alone the L depending on the other incognitas.

To do this just use math to let L alone and you'll find:

P=2L + 2W

P-2W=2L

(P-2W)/2=L

And that's it.