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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(3/x) = 4/7 // - 4/7
X-(3/x)-(4/7) = 0
X-3*x^-1-4/7 = 0
-3*x^-1 = -(X-4/7) // : -3
x^-1 = (4/7-X)/(-3)
-1 < 0
1/(x^1) = (4/7-X)/(-3) // * x^1
1 = x^1*((4/7-X)/(-3)) // : (4/7-X)/(-3)
-3*(4/7-X)^-1 = x^1
x = -3*(4/7-X)^-1
x = -3*(4/7-X)^-1
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