X=3(y+7)

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Solution for X=3(y+7) equation: 



X=3(X+7)

We move all terms to the left:

X-(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=0

We add all the numbers together, and all the variables

-2X-21=0

We move all terms containing X to the left, all other terms to the right

-2X=21

X=21/-2

X=-10+1/2

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