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Aplicamos la regla del aspa simple.
3a² - 4a + 1
3a - 1
a - 1
(3a - 1) (a - 1) = 0
Tenemos dos soluciones.
3a - 1 = 0
3a = 1
a = 1/3.
.................................................
a - 1 = 0
a = 1
.................................................
Solución.
"a = 1" y "a = 1/3"