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4x-9=-(3x+6)
We move all terms to the left:
4x-9-(-(3x+6))=0
We calculate terms in parentheses: -(-(3x+6)), so:We get rid of parentheses
-(3x+6)
We get rid of parentheses
-3x-6
Back to the equation:
-(-3x-6)
4x+3x+6-9=0
We add all the numbers together, and all the variables
7x-3=0
We move all terms containing x to the left, all other terms to the right
7x=3
x=3/7
x=3/7
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