2x + y years ago, Roberto was 3x + y years old. How many years old was Roberto x...【小站备考】

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2x + y years ago, Roberto was 3x + y years old. How many years old was Roberto x years ago?

A.x

B.4x+2y

C.5x+2y

D.6x+2y

E.6x+y

我的答案：