x+21=3(x+7)

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Solution for x+21=3(x+7) equation: 



x+21=3(x+7)

We move all terms to the left:

x+21-(3(x+7))=0



We calculate terms in parentheses: -(3(x+7)), so:

3(x+7)

We multiply parentheses

3x+21

Back to the equation:

-(3x+21)



We get rid of parentheses

x-3x-21+21=0

We add all the numbers together, and all the variables

-2x=0

x=0/-2

x=0

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