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D( x )
(8/3)*x = 0
(8/3)*x = 0
(8/3)*x = 0
8/3*x = 0 // : 8/3
x = 0
x in (-oo:0) U (0:+oo)
y = 5/((8/3)*x)-7 // - 5/((8/3)*x)-7
y-(5/((8/3)*x))+7 = 0
(-15/8)*x^-1+y+7 = 0
-15/8*x^-1 = -(y+7) // : -15/8
x^-1 = 8/15*(y+7)
-1 < 0
1/(x^1) = 8/15*(y+7) // * x^1
1 = 8/15*x^1*(y+7) // : 8/15*(y+7)
15/8*(y+7)^-1 = x^1
x = 15/8*(y+7)^-1
x = 15/8*(y+7)^-1
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