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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+15 = 50 // - 50
5/x-50+15 = 0
5*x^-1 = 35 // : 5
x^-1 = 7
-1 < 0
1/(x^1) = 7 // * x^1
1 = 7*x^1 // : 7
1/7 = x^1
x = 1/7
x = 1/7
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