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D( x )
x = 0
x-1 = 0
x = 0
x = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
(7*x)/(x-1)-(3/x) = 7 // - 7
(7*x)/(x-1)-(3/x)-7 = 0
(7*x)/(x-1)-3*x^-1-7 = 0
(7*x)/(x-1)-3/x-7 = 0
(7*x*x)/(x*(x-1))+(-3*(x-1))/(x*(x-1))+(-7*x*(x-1))/(x*(x-1)) = 0
7*x*x-3*(x-1)-7*x*(x-1) = 0
7*x^2-7*x^2-3*x+7*x+3 = 0
4*x+3 = 0
(4*x+3)/(x*(x-1)) = 0
(4*x+3)/(x*(x-1)) = 0 // * x*(x-1)
4*x+3 = 0
4*x+3 = 0 // - 3
4*x = -3 // : 4
x = -3/4
x = -3/4
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