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Tim runs Sox Box, a subscription service that regularly sends fun socks to customers. Each box costs $12.35$ $\$$ to produce and $2.65$ $\$$ to ship. Tim also spends $\$600$ a month on online advertising. He charges his customers $\$35$ per box.$\newline$Which equation can you use to find $b$, the number of boxes Tim must sell each month for his sales to equal his monthly expenses?$\newline$(A) $35 + 12.35b = 600 + 2.65b$$\newline$(B) $35b = 600 + 12.35b + 2.65b$$\newline$How many boxes must Tim sell each month for his sales to equal his monthly expenses?$\newline$$\_\_\_\_$ boxes$\newline$