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x²-6x-⅕(5x²-5x+5x-5)=x²-6x-x²+x-x+5=-2x²-6x+5
(15x²-5x-6x+2)-(2xz+3z-2x-3)=15x²-5x-6x+2-2xz-3z+2x+3=15x²-9x+5-2xz-3z
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x²-6x-⅕(5x²-5x+5x-5)=x²-6x-x²+x-x+5=-2x²-6x+5
(15x²-5x-6x+2)-(2xz+3z-2x-3)=15x²-5x-6x+2-2xz-3z+2x+3=15x²-9x+5-2xz-3z