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5(2l+4)=90
We move all terms to the left:
5(2l+4)-(90)=0
We multiply parentheses
10l+20-90=0
We add all the numbers together, and all the variables
10l-70=0
We move all terms containing l to the left, all other terms to the right
10l=70
l=70/10
l=7
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