a +b -(-a +-b)
a +b -(-a -b)
a + b +a +b
2a + 2b
2(a+b)
la suma de los dos numeros se duplica
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a +b -(-a +-b)
a +b -(-a -b)
a + b +a +b
2a + 2b
2(a+b)
la suma de los dos numeros se duplica