X=y,7+3(-y)=

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



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

We move all terms to the left:

X-(X.7+3(-X))=0

We add all the numbers together, and all the variables

X-(X.7+3(-1X))=0



We calculate terms in parentheses: -(X.7+3(-1X)), so:

X.7+3(-1X)

We multiply parentheses

X.7-3X

We add all the numbers together, and all the variables

-3X+X.7

Back to the equation:

-(-3X+X.7)



We get rid of parentheses

X+3X-X.7=0

We add all the numbers together, and all the variables

4X-X.7=0

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