81=4(2x+9)+x

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Solution for 81=4(2x+9)+x equation: 



81=4(2x+9)+x

We move all terms to the left:

81-(4(2x+9)+x)=0



We calculate terms in parentheses: -(4(2x+9)+x), so:

4(2x+9)+x

We add all the numbers together, and all the variables

x+4(2x+9)

We multiply parentheses

x+8x+36

We add all the numbers together, and all the variables

9x+36

Back to the equation:

-(9x+36)



We get rid of parentheses

-9x-36+81=0

We add all the numbers together, and all the variables

-9x+45=0

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

-9x=-45

x=-45/-9

x=+5

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