Respuesta :
Answer: a = 15
3a + 9 = 54
3a = 54 - 9
a = [tex] \frac{54-9}{3} [/tex]
a = [tex] \frac{45}{3} [/tex]
a = 15
3a + 9 = 54
3a = 54 - 9
a = [tex] \frac{54-9}{3} [/tex]
a = [tex] \frac{45}{3} [/tex]
a = 15