First you make the X by it's self so you minus 100 by each side 100-6x=160-10 - - 100 100 So the problem would be -6x=-10 then you divide each side by 6. -6/6=1 -10/-6=60 I think you can figure it out from there. :-)
Step-by-step explanation: 11x12 because one of them will be the one shaking hands with everyone else so he would have gotten 11 hands shaked so everyone would have gotten their hands shaked 11 times