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

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



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

We move all terms to the left:

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

We get rid of parentheses

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



We calculate terms in parentheses: -((3x-7)), so:

(3x-7)

We get rid of parentheses

3x-7

Back to the equation:

-(3x-7)



We get rid of parentheses

x-3x+7+21=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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