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7x+3(2x+11)=77
We move all terms to the left:
7x+3(2x+11)-(77)=0
We multiply parentheses
7x+6x+33-77=0
We add all the numbers together, and all the variables
13x-44=0
We move all terms containing x to the left, all other terms to the right
13x=44
x=44/13
x=3+5/13
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