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7x+2(2x+13)=136
We move all terms to the left:
7x+2(2x+13)-(136)=0
We multiply parentheses
7x+4x+26-136=0
We add all the numbers together, and all the variables
11x-110=0
We move all terms containing x to the left, all other terms to the right
11x=110
x=110/11
x=10
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