Respuesta :

kortneypadgett

Answer:7

Step-by-step explanation:

Because 3x7=21.

solarjin

if 3x = 21 all you have to do is divide both sides of the equation by 3

3x = 21

3x divided by 3 is x, and 21 divided by 3 is 7

so then you get x = 7

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