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3.5(x+2)=28
We move all terms to the left:
3.5(x+2)-(28)=0
We multiply parentheses
3.5x+7-28=0
We add all the numbers together, and all the variables
3.5x-21=0
We move all terms containing x to the left, all other terms to the right
3.5x=21
x=21/3.5
x=6
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