81=(3+5x)+x

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Solution for 81=(3+5x)+x equation: 



81=(3+5x)+x

We move all terms to the left:

81-((3+5x)+x)=0

We add all the numbers together, and all the variables

-((5x+3)+x)+81=0



We calculate terms in parentheses: -((5x+3)+x), so:

(5x+3)+x

We add all the numbers together, and all the variables

x+(5x+3)

We get rid of parentheses

x+5x+3

We add all the numbers together, and all the variables

6x+3

Back to the equation:

-(6x+3)



We get rid of parentheses

-6x-3+81=0

We add all the numbers together, and all the variables

-6x+78=0

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

-6x=-78

x=-78/-6

x=+13

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