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