-3x-6/x=2x+4/x+5x/x
-3x-6-2x-4-5x/x=0
-10x-10/x=0
facem tabelul semnelor -10x-10=0 ; -10x=10;x=-1
x -infinit -1 0 +infinit
-10x-10 +++++++++0-----------------------------------
x ---------------------------0++++++++++++++
-10x-10/x -------------0++++++/------------------------
=> x=-1