5x+3y-8z+2y-3x+5z+z-7y-x
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5x+3y-8z+2y-3x+5z+z-7y-x
= 5x-3x-x+3y+2y-7y-8z+5z+z
= (5x-3x-x)+(3y+2y-7y)+(-8z+5z+z)
= (5x-4x)+(5y-7y)+(-8z+6z)
= x+(-2y)+(-2z)
= x-2y-2z
the answer is x-2y-2z.
hope it helps.
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