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9) (-2)^2+(-1)^2+(3)^2- (-2x-1)-(-1x3)-(3x-2)
4+1+9-2+3+6
21
10) P+Q+R=0
=7x^2+5xy-9y^2+4y^2-3x^2-6xy-4x^2+xy+5y^2
=0
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