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2x-9=(-2x)+7
We move all terms to the left:
2x-9-((-2x)+7)=0
We calculate terms in parentheses: -((-2x)+7), so:We get rid of parentheses
(-2x)+7
We get rid of parentheses
-2x+7
Back to the equation:
-(-2x+7)
2x+2x-7-9=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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