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