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D( x )
4*x+5 = 0
4*x+5 = 0
4*x+5 = 0
4*x+5 = 0 // - 5
4*x = -5 // : 4
x = -5/4
x in (-oo:-5/4) U (-5/4:+oo)
y = (2-5*x)/(4*x+5) // - (2-5*x)/(4*x+5)
y-((2-5*x)/(4*x+5)) = 0
(-1*(2-5*x))/(4*x+5)+y = 0
(-1*(2-5*x))/(4*x+5)+(y*(4*x+5))/(4*x+5) = 0
y*(4*x+5)-1*(2-5*x) = 0
5*x+4*x*y+5*y-2 = 0
(5*x+4*x*y+5*y-2)/(4*x+5) = 0
(5*x+4*x*y+5*y-2)/(4*x+5) = 0 // * 4*x+5
5*x+4*x*y+5*y-2 = 0
4*x*y+5*y-2 = 0 // - 5*y-2
4*x*y = -(5*y-2) // : 4*y
x = (-(5*y-2))/(4*y)
x = (2-(5*y))/(4*y)
x = (2-(5*y))/(4*y)
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