Add (-8 x^2 + 2y^2z -11) + ( -2x^2 + 9y^2z -1)
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(8x² + 2y²2z -11) + (-2x²+9y²2z-1)
=-8x² + 2y²2z - 11 - 2x² + 9y²2z -1
=-10x² + 11y²4z - 12
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