Frogs fell in the well...

Level 1

12 frogs fell in a dry well after 7 days 7 frogs died\displaystyle 12 ~frogs~fell~in~a~dry~well~after~ 7~days~7~frogs~died  then how many frogs are left in the well.\displaystyle ~then~how~many~frogs~are~left~in~the~well.

This is an entry in the Troll King Contest\text{This is an entry in the Troll King Contest}

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