Respuesta :

olisahgreat

Answer:

3(6 + a) = 69

Step-by-step explanation:

Let the unknown number be a

3(6+a) = 69

18 + 3a = 69

3a = 69-18

3a = 51

a = 51/3

a = 17

meredith48034

Answer:

Step-by-step explanation:

3(x + 6) = 69

3x + 18 = 69

3x  = 51

x = 17