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Mr. Newton wears science-themed ties to school. In all, he has $34$ ties with scientific designs. Of all the ties in his collection, $b$ are bow ties and $21$ are straight ties.$\newline$Which diagram models the story?$\newline$Which equation models the story?$\newline$Choices:$\newline$$(A)$ $b + 21 = 34$$\newline$$(B)$ $b - 21 = 34$