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-23+4x=-3(7x-9)
We move all terms to the left:
-23+4x-(-3(7x-9))=0
We calculate terms in parentheses: -(-3(7x-9)), so:We get rid of parentheses
-3(7x-9)
We multiply parentheses
-21x+27
Back to the equation:
-(-21x+27)
4x+21x-27-23=0
We add all the numbers together, and all the variables
25x-50=0
We move all terms containing x to the left, all other terms to the right
25x=50
x=50/25
x=2
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