Answer:

2x+3y

Step-by-step explanation:

(3x -1x) + 3(y)

2x + 3y

Answer:

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Step-by-step explanation:

let a be added

3x + y + a = 2x + 3y

3x + a = 2x + 3y - y

3x + a = 2x + 2y

a = 2x-3x+2y

a = -x+2y