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28=6x+x
We move all terms to the left:
28-(6x+x)=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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