81=-3(1-7x)-7x

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Solution for 81=-3(1-7x)-7x equation: 



81=-3(1-7x)-7x

We move all terms to the left:

81-(-3(1-7x)-7x)=0

We add all the numbers together, and all the variables

-(-3(-7x+1)-7x)+81=0



We calculate terms in parentheses: -(-3(-7x+1)-7x), so:

-3(-7x+1)-7x

We add all the numbers together, and all the variables

-7x-3(-7x+1)

We multiply parentheses

-7x+21x-3

We add all the numbers together, and all the variables

14x-3

Back to the equation:

-(14x-3)



We get rid of parentheses

-14x+3+81=0

We add all the numbers together, and all the variables

-14x+84=0

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

-14x=-84

x=-84/-14

x=+6

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