Ответ:
-6x^2-9xy+14xy+21y^2-(-12x^2+15y-4xy+5y^2)=6x^2-6xy+16y^2
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Ответ:
-6x^2-9xy+14xy+21y^2-(-12x^2+15y-4xy+5y^2)=6x^2-6xy+16y^2