Add the following algebric expressions..1) 17x-13yz+8zx,-5xy+ 9yz-7zx &-7yz-zx+2xy
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==> (17xy - 13yz + 8zx) + (-5xy + 9yz - 7zx) + (-7yz - zx + 2xy)
==> (17xy - 5xy + 2xy) + (-13yz + 9yz -7yz) + (8zx - 7zx -zx)
==> (14xy) + (-11yz)
==> 14xy - 11yz
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