Respuesta :

X+4x+7+3x-x-21
Add the Xs together
X+4x +3x-x = 7x
7-21=-14
The answer is 7x-14

Answer:

7x-14

Step-by-step explanation:

x +(4x + 7) + 3x -(x+21)​

7x+7-21

7x-14