(x-1/x^2+3x+2)-(6/x^2-x-2)-(x-10/x^2-4)
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=(x-1)/(x+1)(x+2)-6/(x+1)(x-2)-(x-10)/(x+2)(x-2)
=(x^2-3x+2)/(x+1)(x+2)(x-2)-(6x+12)/(x+1)(x+2)(x-2)-(x^2-9x-10)/(x+1)(x+2)(x-2)
=0
=(x^2-3x+2)/(x+1)(x+2)(x-2)-(6x+12)/(x+1)(x+2)(x-2)-(x^2-9x-10)/(x+1)(x+2)(x-2)
=0
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