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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*16-(30/x) = -90 // + 90
2*16-(30/x)+90 = 0
2*16-30*x^-1+90 = 0
-30*x^-1 = -122 // : -30
x^-1 = 61/15
-1 < 0
1/(x^1) = 61/15 // * x^1
1 = 61/15*x^1 // : 61/15
15/61 = x^1
x = 15/61
x = 15/61
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