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2(2x+13)=80
We move all terms to the left:
2(2x+13)-(80)=0
We multiply parentheses
4x+26-80=0
We add all the numbers together, and all the variables
4x-54=0
We move all terms containing x to the left, all other terms to the right
4x=54
x=54/4
x=13+1/2
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