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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