-81=-(1-2a)+8a

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Solution for -81=-(1-2a)+8a equation: 



-81=-(1-2a)+8a

We move all terms to the left:

-81-(-(1-2a)+8a)=0

We add all the numbers together, and all the variables

-(-(-2a+1)+8a)-81=0



We calculate terms in parentheses: -(-(-2a+1)+8a), so:

-(-2a+1)+8a

We add all the numbers together, and all the variables

8a-(-2a+1)

We get rid of parentheses

8a+2a-1

We add all the numbers together, and all the variables

10a-1

Back to the equation:

-(10a-1)



We get rid of parentheses

-10a+1-81=0

We add all the numbers together, and all the variables

-10a-80=0

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

-10a=80

a=80/-10

a=-8

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