Math

Melanie is baking a cake. The recipe calls for 9 cups of flour and 2 cups of sugar. She already put in 3 cups of flour. How many more cups of flour does she need to add ?

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9=total number of cups of flour needed

3=number of cups she has put in

x=number of cups she needs to add

3+x=9

3+x-3=9-3

x=6