81=4x-3(-x-13)

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Solution for 81=4x-3(-x-13) equation: 



81=4x-3(-x-13)

We move all terms to the left:

81-(4x-3(-x-13))=0

We add all the numbers together, and all the variables

-(4x-3(-1x-13))+81=0



We calculate terms in parentheses: -(4x-3(-1x-13)), so:

4x-3(-1x-13)

We multiply parentheses

4x+3x+39

We add all the numbers together, and all the variables

7x+39

Back to the equation:

-(7x+39)



We get rid of parentheses

-7x-39+81=0

We add all the numbers together, and all the variables

-7x+42=0

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

-7x=-42

x=-42/-7

x=+6

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