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a) X-3y = 9
x=9+3y
b) X-2Y = 14
x=14+2y
Igualar
x=x
9+3y=14+2y
3y-2y =14-9
y =5
Sustutir y=5 en (a)
x=9+3y
x= 9+3(5)
x=9+15
x=24