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-(x-(y-x))+(9x-(3x+4y))

 Sep 21, 2017
 #1
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-(x-(y-x))+(9x-(3x+4y))

-(x-y+x)+(9x-3x-4y)

-(x+x-y)+(6x-4y)

-(2x-y)+(6x-4y)

-2x+y+6x-4y

4x-3y

 Sep 21, 2017

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