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7x-2(3+x)=4
We move all terms to the left:
7x-2(3+x)-(4)=0
We add all the numbers together, and all the variables
7x-2(x+3)-4=0
We multiply parentheses
7x-2x-6-4=0
We add all the numbers together, and all the variables
5x-10=0
We move all terms containing x to the left, all other terms to the right
5x=10
x=10/5
x=2
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