200-18:[327 :(3x)-1]-28=166
200-18:(327/3x-1)=166+28
200-18:(109/x-1)=194
200-18:(109/x-x/x)=194
200-18:(109-x)/x=194
200-18×x/(109-x)=194
200-18x/(109-x)=194
18x/109-x=200-194
18x/109-x=6=> 6×(109-x)=18x
654-6x=18x
654=16x+6x
654=24x=>x=654/24 (care se simplifica prin 6)=> x=109/4