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