-6x-9y+15z from x-y-3z
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(-6x-9y+15z)-(x-y-3z)
=-6x-9y+15z-x+y+3z
=-6x-x-9y+y+15z+3z
=7x-10y+18z
=-6x-9y+15z-x+y+3z
=-6x-x-9y+y+15z+3z
=7x-10y+18z
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