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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/3+2/5 = 11/x // - 11/x
1/3-(11/x)+2/5 = 0
1/3-11*x^-1+2/5 = 0
-11*x^-1 = -11/15 // : -11
x^-1 = 1/15
-1 < 0
1/(x^1) = 1/15 // * x^1
1 = 1/15*x^1 // : 1/15
15 = x^1
x = 15
x = 15
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