Respuesta :

arielfaye12

Answer:

21x-28

Step-by-step explanation:

you multiply 7 by 3 and 7 by 4 and bring down the x and subtraction sign

gmany

The distributive property: a(b - c) = ab - ac

7(3x - 4) = (7)(3x) - (7)(4) = 21x - 28

good job