Solve for L
L=\frac{84-w}{5}
Solve for w
w=84-5L
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5L=84-w
Subtract w from both sides.
\frac{5L}{5}=\frac{84-w}{5}
Divide both sides by 5.
L=\frac{84-w}{5}
Dividing by 5 undoes the multiplication by 5.
w=84-5L
Subtract 5L from both sides.
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