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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 10/100 // - 10/100
15/x-(10/100) = 0
15/x-1/10 = 0
15*x^-1 = 1/10 // : 15
x^-1 = 1/150
-1 < 0
1/(x^1) = 1/150 // * x^1
1 = 1/150*x^1 // : 1/150
150 = x^1
x = 150
x = 150
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