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7(2l+10)=210
We move all terms to the left:
7(2l+10)-(210)=0
We multiply parentheses
14l+70-210=0
We add all the numbers together, and all the variables
14l-140=0
We move all terms containing l to the left, all other terms to the right
14l=140
l=140/14
l=10
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