21=(x.3)+7

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



21=(x.3)+7

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

(+x.3)+7

We get rid of parentheses

x.3+7

Back to the equation:

-(x.3+7)



We get rid of parentheses

-x.3-7+21=0

We add all the numbers together, and all the variables

-x.3+14=0

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

-x.3=-14

x=-14/1

x=-14

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