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