SOLUTION: Solve P = 2l + 2w for w (Please explain)

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Question 876763: Solve P = 2l + 2w for w (Please explain)
Answer by tommyt3rd(5050) About Me  (Show Source):
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P = 2l + 2w
P-2l=2l-2l+2w
P-2l=2w
2w=P-2l
w=(P-2l)/2