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D( x )
3*x = 0
5*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
1/(5*x)+1/15 = 2/(3*x) // - 2/(3*x)
1/(5*x)-(2/(3*x))+1/15 = 0
1/(5*x)+(-2/3)*x^-1+1/15 = 0
-7/15*x^-1 = -1/15 // : -7/15
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
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