Find the sum of (-xy+yz) and (xy-yz)
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0 how means the -xy+xy is 0 and +yz-yz is 0 the ans is 0
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-xy+yz+xy-yz
-xy+xy+yz-yz
xy(-1+1) + yz(1-1)
xy(0) + yz(0)
0+0
=0
-xy+yz+xy-yz
-xy+xy+yz-yz
xy(-1+1) + yz(1-1)
xy(0) + yz(0)
0+0
=0
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