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X+2X+3X=-(4X-9)
We move all terms to the left:
X+2X+3X-(-(4X-9))=0
We add all the numbers together, and all the variables
6X-(-(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)
6X+4X-9=0
We add all the numbers together, and all the variables
10X-9=0
We move all terms containing X to the left, all other terms to the right
10X=9
X=9/10
X=9/10
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