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8x2=16
16+4=20
y= número menor
x+y= 12 "1"
2x+y=20 "2"
despejo x en "1"
x=12-y
reemplazo x en "2"
2(12-y)+y=20
24-2y+y=20
24-y=20
-y=20-24
-y=-4
y=4
sustituyo y en "1"
x+4=12
x=12-4
x=8
x=8
y=4