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a + b = 18
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2a = 38
a = 19
Reemplazas "a"
a + b = 18
19 + b = 18
b = -1
Comprobamos
a - b = 20
19 - ( -1 ) = 20
19 + 1 = 20
20 = 20
Rpta: Los números serían 19 y -1