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144=(3x+9)
We move all terms to the left:
144-((3x+9))=0
We calculate terms in parentheses: -((3x+9)), so:We get rid of parentheses
(3x+9)
We get rid of parentheses
3x+9
Back to the equation:
-(3x+9)
-3x-9+144=0
We add all the numbers together, and all the variables
-3x+135=0
We move all terms containing x to the left, all other terms to the right
-3x=-135
x=-135/-3
x=+45
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