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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 30/2-(6/8)-(1/2) // - 30/2-(6/8)-(1/2)
1/x-(30/2)+6/8+1/2 = 0
1/x+6/8+1/2-15 = 0
1*x^-1 = 55/4 // : 1
x^-1 = 55/4
-1 < 0
1/(x^1) = 55/4 // * x^1
1 = 55/4*x^1 // : 55/4
4/55 = x^1
x = 4/55
x = 4/55
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