7x²y-8x²y - -1x²y, 9x⁵yz-2x⁵yz - 7x⁵y²z, -2x²y-8x²y+25x²y - 15x²y, -3x⁴+2x⁴+5x⁴ - 4x⁴, 14+y=4 - -10, x+4=-5 - -9,

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