The sum :
2xy+4yz+5xy+3yz-6xy
The sum :2xy+4yz+5xy+3yz-6xy
Simplify:
(2xy + 4yz + 9) - (3yz - 3xy - 1)
4xy−5yz−7z
–5xy+2yz+zx
–2xy−3yz+3zx
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When 7xy+5yz−3zx, 4yz+9zx−4y and −3xz+5x−2xy are added, we get 5xy+9yz+3zx+5x−4y.