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D( x )
x+3 = 0
4*x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
4*x+3 = 0
4*x+3 = 0
4*x+3 = 0 // - 3
4*x = -3 // : 4
x = -3/4
x in (-oo:-3) U (-3:-3/4) U (-3/4:+oo)
(3*x+1)/(4*x+3) = (x+1)/(x+3) // - (x+1)/(x+3)
(3*x+1)/(4*x+3)-((x+1)/(x+3)) = 0
(3*x+1)/(4*x+3)+(-1*(x+1))/(x+3) = 0
((3*x+1)*(x+3))/((4*x+3)*(x+3))+(-1*(x+1)*(4*x+3))/((4*x+3)*(x+3)) = 0
(3*x+1)*(x+3)-1*(x+1)*(4*x+3) = 0
3*x-x^2 = 0
3*x-x^2 = 0
x*(3-x) = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x*(x-3) = 0
(x*(x-3))/((4*x+3)*(x+3)) = 0
(x*(x-3))/((4*x+3)*(x+3)) = 0 // * (4*x+3)*(x+3)
x*(x-3) = 0
( x-3 )
x-3 = 0 // + 3
x = 3
( x )
x = 0
x in { 3, 0 }
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