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x+(2x+4)=28
We move all terms to the left:
x+(2x+4)-(28)=0
We get rid of parentheses
x+2x+4-28=0
We add all the numbers together, and all the variables
3x-24=0
We move all terms containing x to the left, all other terms to the right
3x=24
x=24/3
x=8
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