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x-y=12
_______
2x=60
x=30
x+y=48
30+y=48
y=18
a - b = 12
Resolvemos de arriba abajo!
2a = 60
a = 30
Entonces!
Buscamos "b"
a + b = 48
30 + b = 48
b = 48 - 30
b = 18
Entonces los números son:
30 y 18
Salu2