Question

please help me !!! and explain your answer !!!
solve for L :

Answer 1

L = $\frac{P}{2}$ - W

P = 2L + 2W = 2(L + W) → ( take out common factor of 2)

divide both sides by 2

$\frac{P}{2}$ = L + W

subtract W from both sides

$\frac{P}{2}$ - W = L