Respuesta :
Answer:
x= 14
Explanation
-21= 7(3-x)
-21= 21-3x
-21 -21
-42= -3x
(divide by -3)
x= 14
x= 14
Explanation
-21= 7(3-x)
-21= 21-3x
-21 -21
-42= -3x
(divide by -3)
x= 14