а) 12x -8y+8y=12x
b) 6xy-(x^2+6xy+9y^2)=6xy-x^2-6xy-9y^2=-x^2-9y^2
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Answers & Comments
а) 12x -8y+8y=12x
b) 6xy-(x^2+6xy+9y^2)=6xy-x^2-6xy-9y^2=-x^2-9y^2