3y+4z-6x-4y+z+2x-8y+5z-x
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3y+4z-6x-4y+z+2x-8y+5z-x
(3y-4y-8y) + (4z+z+5z) + (-6x+2x-x)
(3y-12y) + (5z+5z) + (-7x+2x)
-9y+10z-5x
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