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

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



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

We move all terms to the left:

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

We get rid of parentheses

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



We calculate terms in parentheses: -((3X-21)), so:

(3X-21)

We get rid of parentheses

3X-21

Back to the equation:

-(3X-21)



We get rid of parentheses

X-3X+21+7=0

We add all the numbers together, and all the variables

-2X+28=0

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

-2X=-28

X=-28/-2

X=+14

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