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D( x )
x-7 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:7) U (7:+oo)
-24/(x-7) = 8 // - 8
-24/(x-7)-8 = 0
(-8*(x-7))/(x-7)-24/(x-7) = 0
-8*(x-7)-24 = 0
32-8*x = 0
(32-8*x)/(x-7) = 0
(32-8*x)/(x-7) = 0 // * x-7
32-8*x = 0
32-8*x = 0 // - 32
-8*x = -32 // : -8
x = -32/(-8)
x = 4
x = 4
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