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3 + a : 2 = 19
a : 2 = 19 - 3
a : 2 = 16
a = 2 (16)
a = 32
Respuesta.
a = 32
VERIFICAMOS LA SOLUCIÓN
3 + a : 2 = 19
3 + 32 : 2 = 19
3 + 16 = 19
19 = 19
La solución es correcta!