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72=6l+6(l-6)
We move all terms to the left:
72-(6l+6(l-6))=0
We calculate terms in parentheses: -(6l+6(l-6)), so:We get rid of parentheses
6l+6(l-6)
We multiply parentheses
6l+6l-36
We add all the numbers together, and all the variables
12l-36
Back to the equation:
-(12l-36)
-12l+36+72=0
We add all the numbers together, and all the variables
-12l+108=0
We move all terms containing l to the left, all other terms to the right
-12l=-108
l=-108/-12
l=+9
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