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D( x )
x/3 = 0
x/3 = 0
x/3 = 0
1/3*x = 0 // : 1/3
x = 0
x in (-oo:0) U (0:+oo)
7*y = 8/(x/3) // - 8/(x/3)
7*y-(8/(x/3)) = 0
7*y-24*x^-1 = 0
-24*x^-1 = -(7*y) // : -24
x^-1 = (-7*y)/(-24)
-1 < 0
1/(x^1) = (-7*y)/(-24) // * x^1
1 = x^1*((-7*y)/(-24)) // : (-7*y)/(-24)
(24*y^-1)/7 = x^1
x = (24*y^-1)/7
x = (24*y^-1)/7
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