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Tenemos.
4(3a) + 16 = - 20; a = - 7/3
Aplicamos la propiedad distributiva.
a(b + c) =ab + ac
Resolver.
4 (3a) + 16 = - 20
12a + 16 = - 20
Despejamos la variable "a".
12a = - 20 - 16
12a = - 36
a = - 36/12
a = - 3
Entonces el valor de a es - 3.
La afirmación es incorrecta, el valor de a no vale -7/3. Vale - 3