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75=(4x-9)
We move all terms to the left:
75-((4x-9))=0
We calculate terms in parentheses: -((4x-9)), so:We get rid of parentheses
(4x-9)
We get rid of parentheses
4x-9
Back to the equation:
-(4x-9)
-4x+9+75=0
We add all the numbers together, and all the variables
-4x+84=0
We move all terms containing x to the left, all other terms to the right
-4x=-84
x=-84/-4
x=+21
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