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3x=45
x=45/3=15
15+2(15)=45
x+2x=261
3x=261
x=261/3=87
87+2(87)=261
x+3x=384
4x=384
x=384/4=96
96+3(96)=384
n+2n = 261 => n = 87
n+3n = 384 => n = 96
son las respuestas respectivamente