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9-2x=-(5+4x)
We move all terms to the left:
9-2x-(-(5+4x))=0
We add all the numbers together, and all the variables
-2x-(-(4x+5))+9=0
We calculate terms in parentheses: -(-(4x+5)), so:We get rid of parentheses
-(4x+5)
We get rid of parentheses
-4x-5
Back to the equation:
-(-4x-5)
-2x+4x+5+9=0
We add all the numbers together, and all the variables
2x+14=0
We move all terms containing x to the left, all other terms to the right
2x=-14
x=-14/2
x=-7
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