81=3(6+7x)

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Solution for 81=3(6+7x) equation: 



81=3(6+7x)

We move all terms to the left:

81-(3(6+7x))=0

We add all the numbers together, and all the variables

-(3(7x+6))+81=0



We calculate terms in parentheses: -(3(7x+6)), so:

3(7x+6)

We multiply parentheses

21x+18

Back to the equation:

-(21x+18)



We get rid of parentheses

-21x-18+81=0

We add all the numbers together, and all the variables

-21x+63=0

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

-21x=-63

x=-63/-21

x=+3

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