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--28=7(x-7)
We move all terms to the left:
--28-(7(x-7))=0
We add all the numbers together, and all the variables
-(7(x-7))=0
We calculate terms in parentheses: -(7(x-7)), so:We get rid of parentheses
7(x-7)
We multiply parentheses
7x-49
Back to the equation:
-(7x-49)
-7x+49=0
We move all terms containing x to the left, all other terms to the right
-7x=-49
x=-49/-7
x=+7
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