Find the sum of expression :-
x²-xy + yz ; 2xy + yz -2x²; 3yz + 3x²+xy
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x2-xy+yz+2xy+yz-2x2+3yz+3x2+xy
3x2+x2-2x2-xy+xy +yz+yz+2xy+3yz
2x2+2yz+2xy+3yz
2x2+5yz+2xy......
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