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