There are 3 bags of marbles in the left side pan of a balance. Each bag has the same number of marbles. After you put 9 marbles in the right-side pan, the pans hang evenly. How many marbles are in each bag? Draw a picture to represent the problem. Write an expression for the number of marbles in Example each pan. number of marbles in left-side pan: 3x number of marbles in right-side pan: 9 Write an equation to show that the expressions are equivalent: 3x = 9. What operation does the expression 3x involve?

What is the inverse of this operation?​