8/(6+x) – 8(x-7) = (8(x-7)-8(x+6)) / (x+6)(x-7) = (8x-56-8x-48) / (x²-7x+6x-42) = –104/(x²-x-42).
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8/(6+x) – 8(x-7) = (8(x-7)-8(x+6)) / (x+6)(x-7) = (8x-56-8x-48) / (x²-7x+6x-42) = –104/(x²-x-42).