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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
a+4/x = 5*b // - 5*b
a-(5*b)+4/x = 0
a-5*b+4/x = 0
4*x^-1 = -(a-5*b) // : 4
x^-1 = (-(a-5*b))/4
-1 < 0
1/(x^1) = (-(a-5*b))/4 // * x^1
1 = x^1*((-(a-5*b))/4) // : (-(a-5*b))/4
-4*(a-5*b)^-1 = x^1
x = -4*(a-5*b)^-1
x = -4*(a-5*b)^-1
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