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D( x )
6*x = 0
3*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
2/(3*x)-(5/(6*x)) = 4 // - 4
2/(3*x)-(5/(6*x))-4 = 0
2/(3*x)+(-5/6)*x^-1-4 = 0
-1/6*x^-1 = 4 // : -1/6
x^-1 = -24
-1 < 0
1/(x^1) = -24 // * x^1
1 = -24*x^1 // : -24
-1/24 = x^1
x = -1/24
x = -1/24
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