81=(x+3)+x

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



81=(x+3)+x

We move all terms to the left:

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



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

(x+3)+x

We add all the numbers together, and all the variables

x+(x+3)

We get rid of parentheses

x+x+3

We add all the numbers together, and all the variables

2x+3

Back to the equation:

-(2x+3)



We get rid of parentheses

-2x-3+81=0

We add all the numbers together, and all the variables

-2x+78=0

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

-2x=-78

x=-78/-2

x=+39

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