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D( x )
10*x = 0
3*x = 0
10*x = 0
10*x = 0
10*x = 0 // : 10
x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
2/(3*x)+3/5 = 9/(10*x) // - 9/(10*x)
2/(3*x)-(9/(10*x))+3/5 = 0
2/(3*x)+(-9/10)*x^-1+3/5 = 0
-7/30*x^-1 = -3/5 // : -7/30
x^-1 = 18/7
-1 < 0
1/(x^1) = 18/7 // * x^1
1 = 18/7*x^1 // : 18/7
7/18 = x^1
x = 7/18
x = 7/18
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