Respuesta :

The correct anwser is "C.x= 4"
2x-3+4x=21

First, get rid of the three by adding it to both sides so you get:
2x+4x=24

Next, you add like things, so that you get:
6x=24

Finally, you divide both sides by 6 so that you get x=4.
The answer to your problem is C.