7x+21=(x+3)

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



7x+21=(x+3)

We move all terms to the left:

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



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

(x+3)

We get rid of parentheses

x+3

Back to the equation:

-(x+3)



We get rid of parentheses

7x-x-3+21=0

We add all the numbers together, and all the variables

6x+18=0

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

6x=-18

x=-18/6

x=-3

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