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Whenever Pam travels to a new city, she buys a souvenir mug for her collection. Pam needed to make room for new souvenirs, so she sold $18$ of her oldest mugs at a garage sale. Now, Pam has $24$ souvenir mugs left in her collection.$\newline$Let $m$ represent how many mugs Pam had in her collection to start. Which equation models the problem?$\newline$Choices:$\newline$(A) $m - 18 = 24$$\newline$(B) $18 + m = 24$$\newline$Solve this equation to find how many mugs Pam had in her collection to start.$\newline$$\_\_\_$ mugs$\newline$