Respuesta :

[tex]3x-21=3(x-7)[/tex]

If you're solving this equation when it's set equal to zero, the only solution would be [tex]x=7[/tex]
Here, take 3 as a common 'cause it is GCD of 3 and 21
3x - 21 = 3(x - 7)

In short, Your Answer would be 3(x - 7)

Hope this helps!
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