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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)
5/(x+3)+3 = (4*x)/(x+3) // - (4*x)/(x+3)
5/(x+3)-((4*x)/(x+3))+3 = 0
5/(x+3)-4*x*(x+3)^-1+3 = 0
5/(x+3)+(-4*x)/(x+3)+3 = 0
5/(x+3)+(-4*x)/(x+3)+(3*(x+3))/(x+3) = 0
3*(x+3)-4*x+5 = 0
3*x-4*x+5+9 = 0
14-x = 0
(14-x)/(x+3) = 0
(14-x)/(x+3) = 0 // * x+3
14-x = 0
14-x = 0 // - 14
-x = -14 // * -1
x = 14
x = 14
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