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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*b-(5*x))/x = 0
(3*b-5*x)/x = 0
3*b-5*x = 0 // - 3*b
-5*x = -(3*b) // : -5
x = (-(3*b))/(-5)
x = (-3*b)/(-5)
x = (-3*b)/(-5)
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