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12x-2y=8
la 2ª la multiplicamos por 2
8x+4y=44
24x-4y=16
sumamos
32x=28
x=28/32=7/8
sustituimos en la 1ª el valor de x
8x+4y=44
8*(7/8)+4y=44
7+4y=44
4y=37
y=37/4