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D( x )
3-x = 0
2*x = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:3) U (3:+oo)
y/(2*x) = (6-(2*y))/(3-x) // - (6-(2*y))/(3-x)
y/(2*x)-((6-(2*y))/(3-x)) = 0
y/(2*x)-((6-2*y)/(3-x)) = 0
(-1*(6-2*y))/(3-x)+y/(2*x) = 0
(-1*2*x*(6-2*y))/(2*x*(3-x))+(y*(3-x))/(2*x*(3-x)) = 0
y*(3-x)-1*2*x*(6-2*y) = 0
3*x*y-12*x+3*y = 0
3*x*y-12*x+3*y = 0
3*(x*y-4*x+y) = 0
x*y+y = 0 // - y
x*y = -y // : y
x = -y/y
x = -1
3*(x+1) = 0
(3*(x+1))/(2*x*(3-x)) = 0
(3*(x+1))/(2*x*(3-x)) = 0 // * 2*x*(3-x)
3*(x+1) = 0
x+1 = 0 // - 1
x = -1
x = -1
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