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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
7/(3*x)-(5/6) = 0
7/(3*x)-5/6 = 0
7/3*x^-1 = 5/6 // : 7/3
x^-1 = 5/14
-1 < 0
1/(x^1) = 5/14 // * x^1
1 = 5/14*x^1 // : 5/14
14/5 = x^1
x = 14/5
x = 14/5
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