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D( x )
5-x = 0
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:+oo)
y = 16/(5-x) // - 16/(5-x)
y-(16/(5-x)) = 0
y-16*(5-x)^-1 = 0
y-16/(5-x) = 0
(y*(5-x))/(5-x)-16/(5-x) = 0
y*(5-x)-16 = 0
5*y-(x*y)-16 = 0
(5*y-(x*y)-16)/(5-x) = 0
(5*y-(x*y)-16)/(5-x) = 0 // * 5-x
5*y-(x*y)-16 = 0
x*(-y)+5*y-16 = 0 // - 5*y-16
x*(-y) = -(5*y-16) // : -y
x = (-(5*y-16))/(-y)
x = -(y^-1*(16-(5*y)))
x = -(y^-1*(16-(5*y)))
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