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Rachel, David, and Kristen decide to pool their money to buy a video game system. David contributes 4 dollars more than twice what Kristen does, and Kristen contributes 3 dollars less than Rachel does. If Rachel contributes r dollars, then, in terms of r, how much does David contribute?
A.[m](r-7)/2[/m]
B.[m](r-2)/2[/m]
C.[m](2r+7)/2[/m]
D.2r − 2
E.2r + 7
我的答案：