Respuesta :

18= +5+x
x=3
If you do 3•5, you get 15.
Then do 3+15, you get 18.

18 = 6x                   x+5x is 6x

18/6=6/6               so then you divide 18 and 6 by 6

3=x                     you cancel out the 6 so now it's just x and 18 divided by 6 is 3.