Respuesta :

zam4567

Answer:

12

Step-by-step explanation:

3x + 6 + 48 = 90

3x + 54 = 90

3x = 36

x = 12

ixblueytxi

Answer:

12

Step-by-step explanation:

add 6 and 48 to get 54, then move it to the side where 90 is and subtract it from 90 to get 36. then divide by 3 to get x alone and you get 12.