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x+2(3+x)=8
We move all terms to the left:
x+2(3+x)-(8)=0
We add all the numbers together, and all the variables
x+2(x+3)-8=0
We multiply parentheses
x+2x+6-8=0
We add all the numbers together, and all the variables
3x-2=0
We move all terms containing x to the left, all other terms to the right
3x=2
x=2/3
x=2/3
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