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Camilla is moving next week, and she is comparing rental vehicles that will fit all her furniture. She is deciding between a cargo van that is $7$ feet long and a box truck that is $10$ feet long. Camilla wants as much space as possible, so she decides to rent the box truck since it is $b$ feet longer than the cargo van.$\newline$Which diagram models the story?$\newline$Which equation models the story?$\newline$Choices:$\newline$(A) $b - 10 = 7$$\newline$(B) $7 + b = 10$