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-28+5x=4(3x+7)
We move all terms to the left:
-28+5x-(4(3x+7))=0
We calculate terms in parentheses: -(4(3x+7)), so:We get rid of parentheses
4(3x+7)
We multiply parentheses
12x+28
Back to the equation:
-(12x+28)
5x-12x-28-28=0
We add all the numbers together, and all the variables
-7x-56=0
We move all terms containing x to the left, all other terms to the right
-7x=56
x=56/-7
x=-8
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