81=3(1+4x)+x

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Solution for 81=3(1+4x)+x equation: 



81=3(1+4x)+x

We move all terms to the left:

81-(3(1+4x)+x)=0

We add all the numbers together, and all the variables

-(3(4x+1)+x)+81=0



We calculate terms in parentheses: -(3(4x+1)+x), so:

3(4x+1)+x

We add all the numbers together, and all the variables

x+3(4x+1)

We multiply parentheses

x+12x+3

We add all the numbers together, and all the variables

13x+3

Back to the equation:

-(13x+3)



We get rid of parentheses

-13x-3+81=0

We add all the numbers together, and all the variables

-13x+78=0

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

-13x=-78

x=-78/-13

x=+6

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