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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/2+1/5 = 1/x // - 1/x
3/2-(1/x)+1/5 = 0
3/2-x^-1+1/5 = 0
-1*x^-1 = -17/10 // : -1
x^-1 = 17/10
-1 < 0
1/(x^1) = 17/10 // * x^1
1 = 17/10*x^1 // : 17/10
10/17 = x^1
x = 10/17
x = 10/17
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