The cost of an air conditioner is b dollars more than 3 times the cost of a radio. The total of an air conditioner and a radio is v dollars. Which of the following is the cost of an air conditioner, in dollars?
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A$${v-b}\over{4}$$
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B$${v-b}\over{3}$$
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C$${2v+b}\over{3}$$
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D$${v+3b}\over{4}$$
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E$${3v+b}\over{4}$$
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正确答案: E