Solve P = 2l+2w for w.

w=P/2-I/2

Step-by-step explanation:

P=2I+2w

2w=P-2I

w = (P-2I) / 2

w=P/2-I/2

This is called a literal equation where in this case you solve for w in terms of l and p.

P=2l+2w

Move "2l" over to the other side.

P-2l=2w

Divide by 2 on both sides.

p/2-l=w

Rearrange.

w=p/2-l

answer: p/2-l