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D( x )
2*x = 0
5*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
6/(5*x)+1/(2*x) = -(1/10) // + 1/10
6/(5*x)+1/(2*x)+1/10 = 0
17/10*x^-1 = -1/10 // : 17/10
x^-1 = -1/17
-1 < 0
1/(x^1) = -1/17 // * x^1
1 = -1/17*x^1 // : -1/17
-17 = x^1
x = -17
x = -17
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