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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)
-12/(x-7) = 2 // - 2
-12/(x-7)-2 = 0
(-2*(x-7))/(x-7)-12/(x-7) = 0
-2*(x-7)-12 = 0
2-2*x = 0
(2-2*x)/(x-7) = 0
(2-2*x)/(x-7) = 0 // * x-7
2-2*x = 0
2-2*x = 0 // - 2
-2*x = -2 // : -2
x = -2/(-2)
x = 1
x = 1
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