81=100-b

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Solution for 81=100-b equation: 



81=100-b

We move all terms to the left:

81-(100-b)=0

We add all the numbers together, and all the variables

-(-1b+100)+81=0

We get rid of parentheses

1b-100+81=0

We add all the numbers together, and all the variables

b-19=0

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

b=19

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