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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/10-(1/15) = 1/x // - 1/x
1/10-(1/x)-(1/15) = 0
1/10-x^-1-1/15 = 0
-1*x^-1 = -1/30 // : -1
x^-1 = 1/30
-1 < 0
1/(x^1) = 1/30 // * x^1
1 = 1/30*x^1 // : 1/30
30 = x^1
x = 30
x = 30
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