please tell the answer of this problem
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sum of 2x^2+3y-2z & 9x^2-11y-3z is 11x^2-8y-5y
and subtraction of 3x^2+4y+7z from 11x^2-8y-5z is 8x^2-12y-12z
and subtraction of 3x^2+4y+7z from 11x^2-8y-5z is 8x^2-12y-12z
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