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D( x )
3*x+2 = 0
3*x+2 = 0
3*x+2 = 0
3*x+2 = 0 // - 2
3*x = -2 // : 3
x = -2/3
x in (-oo:-2/3) U (-2/3:+oo)
(3*x-2)/(3*x+2) = 4 // - 4
(3*x-2)/(3*x+2)-4 = 0
(3*x-2)/(3*x+2)+(-4*(3*x+2))/(3*x+2) = 0
3*x-4*(3*x+2)-2 = 0
-9*x-10 = 0
(-9*x-10)/(3*x+2) = 0
(-9*x-10)/(3*x+2) = 0 // * 3*x+2
-9*x-10 = 0
-9*x-10 = 0 // + 10
-9*x = 10 // : -9
x = 10/(-9)
x = -10/9
x = -10/9
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