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4x= y comprobamos
4x= y x+y=55
x + y=55 4(11)= 44 11+44= 55
4x-y 44= 44
se cancela la y...y queda
5x= 55
x=55/5
x= 11
11 + y = 55
55 - 11 =y
44= y
los numeros son 44 y 11