Solve for l
l=-\frac{L}{2}+90
Solve for L
L=180-2l
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L=180-2l
Multiply both sides of the equation by 20, the least common multiple of 20,10.
180-2l=L
Swap sides so that all variable terms are on the left hand side.
-2l=L-180
Subtract 180 from both sides.
\frac{-2l}{-2}=\frac{L-180}{-2}
Divide both sides by -2.
l=\frac{L-180}{-2}
Dividing by -2 undoes the multiplication by -2.
l=-\frac{L}{2}+90
Divide L-180 by -2.
L=180-2l
Multiply both sides of the equation by 20, the least common multiple of 20,10.
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