81=(18+b)*2

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Solution for 81=(18+b)*2 equation: 



81=(18+b)*2

We move all terms to the left:

81-((18+b)*2)=0

We add all the numbers together, and all the variables

-((b+18)*2)+81=0



We calculate terms in parentheses: -((b+18)*2), so:

(b+18)*2

We multiply parentheses

2b+36

Back to the equation:

-(2b+36)



We get rid of parentheses

-2b-36+81=0

We add all the numbers together, and all the variables

-2b+45=0

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

-2b=-45

b=-45/-2

b=22+1/2

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