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7(2l+5)=189
We move all terms to the left:
7(2l+5)-(189)=0
We multiply parentheses
14l+35-189=0
We add all the numbers together, and all the variables
14l-154=0
We move all terms containing l to the left, all other terms to the right
14l=154
l=154/14
l=11
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