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luego
2(4+3y)-3y=5
8+6y-3y=5
3y=5-8
3y=-3
y=-3/3
y=(-1)
entonces
x-3(-1)=4
x+3=4
x=4-3
x=1
y para comprobar reemplazas el valor de X y de Y :
(1)-3(-1)=4
1+3=4
4=4
2(1)-3(-1)=5
2+3=5
5=5