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