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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x+9 = 8/5 // - 8/5
16/x-(8/5)+9 = 0
16/x-8/5+9 = 0
16*x^-1 = -37/5 // : 16
x^-1 = -37/80
-1 < 0
1/(x^1) = -37/80 // * x^1
1 = -37/80*x^1 // : -37/80
-80/37 = x^1
x = -80/37
x = -80/37
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