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7x-2(x+1)=13
We move all terms to the left:
7x-2(x+1)-(13)=0
We multiply parentheses
7x-2x-2-13=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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