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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(4/x) = 3/5 // - 3/5
X-(4/x)-(3/5) = 0
X-4*x^-1-3/5 = 0
-4*x^-1 = -(X-3/5) // : -4
x^-1 = (3/5-X)/(-4)
-1 < 0
1/(x^1) = (3/5-X)/(-4) // * x^1
1 = x^1*((3/5-X)/(-4)) // : (3/5-X)/(-4)
-4*(3/5-X)^-1 = x^1
x = -4*(3/5-X)^-1
x = -4*(3/5-X)^-1
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