\[p=2l+2w\]
Solving for l. Want to solve for w instead?
1
Factor out the common term 22.
p=2(l+w)p=2(l+w)

2
Divide both sides by 22.
p2=l+w\frac{p}{2}=l+w

3
Subtract ww from both sides.
p2−w=l\frac{p}{2}-w=l

4
Switch sides.
l=p2−wl=\frac{p}{2}-w

Done
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