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