Verified Answer :

LammettHash

\(3x-21=3(x-7)\)

If you're solving this equation when it's set equal to zero, the only solution would be \(x=7\)

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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