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6(2l+7)=150
We move all terms to the left:
6(2l+7)-(150)=0
We multiply parentheses
12l+42-150=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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