please solve this sum
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x^2+y^2+z^2+ 2x^2- 3y^2/5 +2x^2 + 5x^2+2y^2+ 5z^2 / 7
10x^2+3y^2 -3y^2/5 +z^2 +5z^2 /7
10x^2+15y^2-3y^2/5 +7z^2+5x^2/7
10x^2+12y^2/5 +12z^2/7
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