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X+y= 90
X+40= 90
X= 90-40
X= 50
3x+y= 180
3(50)+y= 180
150+y= 180
Y= 180 - 150
Y= 30
Comprobamos
Dice que el complemento de x es 40
X+40= 90
50+40= 90
90= 90
Hayar el suplemento de 3x
3x+ 30= 180
3(50)+30= 180
150+30= 180.
El suolento de 3x es 30
Saludos❤️