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3x-3x=7x-28
We move all terms to the left:
3x-3x-(7x-28)=0
We add all the numbers together, and all the variables
-(7x-28)=0
We get rid of parentheses
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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