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-99=(-4x+9)
We move all terms to the left:
-99-((-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-9-99=0
We add all the numbers together, and all the variables
4x-108=0
We move all terms containing x to the left, all other terms to the right
4x=108
x=108/4
x=27
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