Another way of looking at it. You are given the equation 0,2x= 7. You want an equation of the form x= something. That is, you want x alone. In the given equation it is not alone because it is multiplied by 0,2. You want to "undo" that. You "undo" multiplication by dividing! And, of course, in order to keep an equation true, whatever you do to one side you must do to the other. Dividing both sides of 0,2x= 7 gives x= 7/0,2= what?