Respuesta :

Answer:

  • x = 11

Step-by-step explanation:

3(4 + x) = 45

=> 12 + 3x = 45

=> 3x = 33

=> x = 11

Conclusion:

Therefore:

  • x = 11

Hoped this helped.
the x is 11 because 4+11 = 15 and 15x3= 45 .