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D( x )
(a-b)^3 = 0
(a-b)^3 = 0
(a-b)^3 = 0
x in (-oo:+oo)
x*((((5*x^3)/((a-b)^3))*(a-b))/10) = 0
(5*x*x^3)/(10*(a-b)^2) = 0
( 5*x^3 )
5*x^3 = 0 // : 5
x^3 = 0
x = 0
( x )
x = 0
x in { 0, 0 }
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