Respuesta :

Answer:

4x + 1 = 9

Step-by-step explanation:

3x + 12 -12 = 18 - 12 ---> 3x = 6 ---> x = 2.

Since x = 2,  4x + 1 is the same as (4 * 2) + 1.

(4 * 2) + 1 = 9.