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D( x )
((x-9)^1)/2 = 0
((x-9)^1)/2 = 0
((x-9)^1)/2 = 0
(x-9)/2 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:9) U (9:+oo)
y = 7/(((x-9)^1)/2) // - 7/(((x-9)^1)/2)
y-(7/(((x-9)^1)/2)) = 0
y-14*(x-9)^-1 = 0
y-14/(x-9) = 0
(y*(x-9))/(x-9)-14/(x-9) = 0
y*(x-9)-14 = 0
x*y-9*y-14 = 0
(x*y-9*y-14)/(x-9) = 0
(x*y-9*y-14)/(x-9) = 0 // * x-9
x*y-9*y-14 = 0
x*y-9*y-14 = 0 // + -9*y-14
x*y = -(-9*y-14) // : y
x = (-(-9*y-14))/y
x = (14-(-9*y))/y
x = (14-(-9*y))/y
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