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D( x )
9-(4*x) = 0
9-(4*x) = 0
9-(4*x) = 0
9-4*x = 0
9-4*x = 0 // - 9
-4*x = -9 // : -4
x = -9/(-4)
x = 9/4
x in (-oo:9/4) U (9/4:+oo)
y = (3*x+1)/(9-(4*x)) // - (3*x+1)/(9-(4*x))
y-((3*x+1)/(9-(4*x))) = 0
y-((3*x+1)/(9-4*x)) = 0
(-1*(3*x+1))/(9-4*x)+y = 0
(-1*(3*x+1))/(9-4*x)+(y*(9-4*x))/(9-4*x) = 0
y*(9-4*x)-1*(3*x+1) = 0
9*y-3*x-4*x*y-1 = 0
(9*y-3*x-4*x*y-1)/(9-4*x) = 0
(9*y-3*x-4*x*y-1)/(9-4*x) = 0 // * 9-4*x
9*y-3*x-4*x*y-1 = 0
9*y-4*x*y-1 = 0 // - 9*y-1
-4*x*y = -(9*y-1) // : -4*y
x = (-(9*y-1))/(-4*y)
x = (1-(9*y))/(-4*y)
x = (1-(9*y))/(-4*y)
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