Devin pays $243 in advance on his account at the athletic club. Each time he uses the club, $6 is deducted from the account. The balance remaining in his account after x visits to the club can be modeled by the equation B(x) = 243 - 6x. Find the number of times Devin has been to the club when the account balance is $171.
A) 11
B) 13
C) 14
D) 12
E) None of these
D) 12
Mathematics
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A. 
B. 
C. 
D. 
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