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-(7-2x)=9-2x
We move all terms to the left:
-(7-2x)-(9-2x)=0
We add all the numbers together, and all the variables
-(-2x+7)-(-2x+9)=0
We get rid of parentheses
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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