X+21+2x=3(x+7)

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Solution for X+21+2x=3(x+7) equation: 



X+21+2X=3(X+7)

We move all terms to the left:

X+21+2X-(3(X+7))=0

We add all the numbers together, and all the variables

3X-(3(X+7))+21=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

3X-3X-21+21=0

We add all the numbers together, and all the variables

=0

X=0/1

X=0

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