Respuesta:
2
Explicación paso a paso:
2 (3a) = 6a
a + 3a + 6a = 20
10a = 20
a = 2
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Respuesta:
2
Explicación paso a paso:
2 (3a) = 6a
a + 3a + 6a = 20
10a = 20
a = 2