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48=-3(3x-7)
We move all terms to the left:
48-(-3(3x-7))=0
We calculate terms in parentheses: -(-3(3x-7)), so:We get rid of parentheses
-3(3x-7)
We multiply parentheses
-9x+21
Back to the equation:
-(-9x+21)
9x-21+48=0
We add all the numbers together, and all the variables
9x+27=0
We move all terms containing x to the left, all other terms to the right
9x=-27
x=-27/9
x=-3
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