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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)
2/(5*x)+9/10 = 13/(2*x)+3/5 // - 13/(2*x)+3/5
2/(5*x)-(13/(2*x))+9/10-(3/5) = 0
2/(5*x)+(-13/2)*x^-1+9/10-3/5 = 0
-61/10*x^-1 = -3/10 // : -61/10
x^-1 = 3/61
-1 < 0
1/(x^1) = 3/61 // * x^1
1 = 3/61*x^1 // : 3/61
61/3 = x^1
x = 61/3
x = 61/3
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