(x+7)=21(x+7)

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



(x+7)=21(x+7)

We move all terms to the left:

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

We get rid of parentheses

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



We calculate terms in parentheses: -(21(x+7)), so:

21(x+7)

We multiply parentheses

21x+147

Back to the equation:

-(21x+147)



We get rid of parentheses

x-21x-147+7=0

We add all the numbers together, and all the variables

-20x-140=0

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

-20x=140

x=140/-20

x=-7

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