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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*a)/x = (5*b)/x-1 // - (5*b)/x-1
(5*a)/x-((5*b)/x)+1 = 0
(5*a)/x-5*b*x^-1+1 = 0
5*a*x^-1-5*b*x^-1+1 = 0
t_1 = x^-1
5*a*t_1^1-5*b*t_1^1+1 = 0
1-5*b*t_1 = 0 // - 1
-5*b*t_1 = -1 // : -5*b
t_1 = -1/(-5*b)
t_1 = -1/(-5*b)
x^-1-(-1/(-5*b)) = 0
(-1/5)*b^-1+x^-1 = 0
1*x^-1 = -(-1/5*b^-1) // : 1
x^-1 = 1/5*b^-1
-1 < 0
1/(x^1) = 1/5*b^-1 // * x^1
1 = 1/5*b^-1*x^1 // : 1/5*b^-1
5*b = x^1
x = 5*b
x = 5*b
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