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Mary = y
x+y= 12 ---(2)
Sustituyendo 1 en 2
3y+y= 12
4y= 12
y= 12/4
y= 3 Maru
x= 3y
x= 3(3)
y= 9 Miguel
comprobación
x+y= 12
3+9= 12
12= 12
M= Miguel
N= Maru
M= 3N
M+N = 12
3N+N=12
4N = 12
N= 12/4
N= 3
M + N = 12
M +3 = 12
M = 12-3
M = 9
R.
Miguel M = 9
Maru N = 3