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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)/(x+3) = 5-(6/(x+3)) // - 5-(6/(x+3))
(2*x)/(x+3)+6/(x+3)-5 = 0
(2*x)/(x+3)+6/(x+3)+(-5*(x+3))/(x+3) = 0
2*x-5*(x+3)+6 = 0
2*x-5*x-15+6 = 0
-3*x-9 = 0
(-3*x-9)/(x+3) = 0
(-3*x-9)/(x+3) = 0 // * x+3
-3*x-9 = 0
-3*x-9 = 0 // + 9
-3*x = 9 // : -3
x = 9/(-3)
x = -3
x in { -3}
x belongs to the empty set
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