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D( x )
5*x-8 = 0
5*x-8 = 0
5*x-8 = 0
5*x-8 = 0 // + 8
5*x = 8 // : 5
x = 8/5
x in (-oo:8/5) U (8/5:+oo)
y = (8-(9*x))/(5*x-8) // - (8-(9*x))/(5*x-8)
y-((8-(9*x))/(5*x-8)) = 0
y-((8-9*x)/(5*x-8)) = 0
(-1*(8-9*x))/(5*x-8)+y = 0
(-1*(8-9*x))/(5*x-8)+(y*(5*x-8))/(5*x-8) = 0
y*(5*x-8)-1*(8-9*x) = 0
9*x+5*x*y-8*y-8 = 0
(9*x+5*x*y-8*y-8)/(5*x-8) = 0
(9*x+5*x*y-8*y-8)/(5*x-8) = 0 // * 5*x-8
9*x+5*x*y-8*y-8 = 0
5*x*y-8*y-8 = 0 // + -8*y-8
5*x*y = -(-8*y-8) // : 5*y
x = (-(-8*y-8))/(5*y)
x = (8-(-8*y))/(5*y)
x = (8-(-8*y))/(5*y)
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