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D( x )
x+7 = 0
x-1 = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-7) U (-7:1) U (1:+oo)
(5*x)/(x+7) = x/(x-1) // - x/(x-1)
(5*x)/(x+7)-(x/(x-1)) = 0
(5*x)/(x+7)+(-1*x)/(x-1) = 0
(5*x*(x-1))/((x+7)*(x-1))+(-1*x*(x+7))/((x+7)*(x-1)) = 0
5*x*(x-1)-1*x*(x+7) = 0
4*x^2-12*x = 0
4*x^2-12*x = 0
4*x*(x-3) = 0
x-3 = 0 // + 3
x = 3
4*x*(x-3) = 0
(4*x*(x-3))/((x+7)*(x-1)) = 0
(4*x*(x-3))/((x+7)*(x-1)) = 0 // * (x+7)*(x-1)
4*x*(x-3) = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 0, 3 }
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