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D( x )
x = 0
x-8 = 0
x = 0
x = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:0) U (0:8) U (8:+oo)
7/(x-8) = 3/x // - 3/x
7/(x-8)-(3/x) = 0
7/(x-8)-3*x^-1 = 0
7/(x-8)-3/x = 0
(7*x)/(x*(x-8))+(-3*(x-8))/(x*(x-8)) = 0
7*x-3*(x-8) = 0
4*x+24 = 0
(4*x+24)/(x*(x-8)) = 0
(4*x+24)/(x*(x-8)) = 0 // * x*(x-8)
4*x+24 = 0
4*x+24 = 0 // - 24
4*x = -24 // : 4
x = -24/4
x = -6
x = -6
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