81=-4(-8-b)+36

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Solution for 81=-4(-8-b)+36 equation: 



81=-4(-8-b)+36

We move all terms to the left:

81-(-4(-8-b)+36)=0

We add all the numbers together, and all the variables

-(-4(-1b-8)+36)+81=0



We calculate terms in parentheses: -(-4(-1b-8)+36), so:

-4(-1b-8)+36

We multiply parentheses

4b+32+36

We add all the numbers together, and all the variables

4b+68

Back to the equation:

-(4b+68)



We get rid of parentheses

-4b-68+81=0

We add all the numbers together, and all the variables

-4b+13=0

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

-4b=-13

b=-13/-4

b=3+1/4

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