X-7=4(y-7)

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Solution for X-7=4(y-7) equation: 



X-7=4(X-7)

We move all terms to the left:

X-7-(4(X-7))=0



We calculate terms in parentheses: -(4(X-7)), so:

4(X-7)

We multiply parentheses

4X-28

Back to the equation:

-(4X-28)



We get rid of parentheses

X-4X+28-7=0

We add all the numbers together, and all the variables

-3X+21=0

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

-3X=-21

X=-21/-3

X=+7

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