Solve for l
l=70
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720=8l+90+l
Combine 7l and l to get 8l.
720=9l+90
Combine 8l and l to get 9l.
9l+90=720
Swap sides so that all variable terms are on the left hand side.
9l=720-90
Subtract 90 from both sides.
9l=630
Subtract 90 from 720 to get 630.
l=\frac{630}{9}
Divide both sides by 9.
l=70
Divide 630 by 9 to get 70.
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