Respuesta :

Answer:

A

Step-by-step explanation:

(x+yi)+(2(x+yi)+3i)=9

x+yi+2x+2yi+3i=9

3x+3yi+3i=9+0i

equating real and imaginary parts

3x=9,x=9/3=3

3y+3=0

3y=-3

y=-3/3=-1

x+yi=3-i

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