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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X-3)/x = 4/5 // - 4/5
(X-3)/x-(4/5) = 0
(X-3)/x-4/5 = 0
(5*(X-3))/(5*x)+(-4*x)/(5*x) = 0
5*(X-3)-4*x = 0
5*X-4*x-15 = 0
(5*X-4*x-15)/(5*x) = 0
(5*X-4*x-15)/(5*x) = 0 // * 5*x
5*X-4*x-15 = 0
5*X-4*x-15 = 0 // - 5*X-15
-4*x = -(5*X-15) // : -4
x = (-(5*X-15))/(-4)
x = (15-(5*X))/(-4)
x = (15-(5*X))/(-4)
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