6x(x-y+z)-3y(x+y-z)from2z(-x+y+z)
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2z(-x+y+z) - ((6x(x-y+z))-3y(x+y-z)
= -2xz+2yz+2z²-(6x²-6xy+6xz-3xy+3y²-3yz)
= -2xz+2yz+2z²-6x²+9xy-3y²+3yz-6xz
=2z²-6x²-3y²-8xz+9xy-yz
Hope it helps.... :)
= -2xz+2yz+2z²-(6x²-6xy+6xz-3xy+3y²-3yz)
= -2xz+2yz+2z²-6x²+9xy-3y²+3yz-6xz
=2z²-6x²-3y²-8xz+9xy-yz
Hope it helps.... :)
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