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D( x )
5-(2*x) = 0
5-(2*x) = 0
5-(2*x) = 0
5-2*x = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
y = (3*x+1)/(5-(2*x)) // - (3*x+1)/(5-(2*x))
y-((3*x+1)/(5-(2*x))) = 0
y-((3*x+1)/(5-2*x)) = 0
(-1*(3*x+1))/(5-2*x)+y = 0
(-1*(3*x+1))/(5-2*x)+(y*(5-2*x))/(5-2*x) = 0
y*(5-2*x)-1*(3*x+1) = 0
5*y-3*x-2*x*y-1 = 0
(5*y-3*x-2*x*y-1)/(5-2*x) = 0
(5*y-3*x-2*x*y-1)/(5-2*x) = 0 // * 5-2*x
5*y-3*x-2*x*y-1 = 0
5*y-2*x*y-1 = 0 // - 5*y-1
-2*x*y = -(5*y-1) // : -2*y
x = (-(5*y-1))/(-2*y)
x = (1-(5*y))/(-2*y)
x = (1-(5*y))/(-2*y)
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