subtract . 1. 2x + yz from xy - yz - zx .
2. x - 3xy - 2y from 2x + 4xy - 5y .
3. - m + 3 mn from 3 m - 3 mn + 8 .
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Step-by-step explanation:
1) xy-yz-zx-(2x+yz)
=xy-yz-zx-2x-yz
= xy-2yz-zx-2x
2) 2x+4xy-5y-(x-3xy-2y)
=2x+4xy-5y-x+3xy+2y
=x+7xy-3y
3) 3m-3mn+8-(-m+3)
=3m-3mn+8+m-3
=4m-3mn+5
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