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D( x )
(10*x^5)/(7*b^2*x) = 0
7*b^2*x = 0
10*b = 0
(10*x^5)/(7*b^2*x) = 0
(10*x^5)/(7*b^2*x) = 0
10/7*b^-2*x^4 = 0 // : 10/7*b^-2
x^4 = 0
x = 0
7*b^2*x = 0
7*b^2*x = 0
7*b^2*x = 0 // : 7*b^2
x = 0
10*b = 0
10*b = 0
10*b = 0
x należy do R
x belongs to the empty set
((5*x^3)/(10*b))/((10*x^5)/(7*b^2*x)) = 0
x belongs to the empty set
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