If 5x + y = 2x + 4y, what is x in terms of y?

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If 5x + y = 2x + 4y, what is x in terms of y?

A、$$\frac{3}{5}y$$
B、$$\frac{5}{7}y$$
C、y
D、$$\frac{7}{5}y$$
E、2y

答案：C

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