27=15-b

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Solution for 27=15-b equation: 



27=15-b

We move all terms to the left:

27-(15-b)=0

We add all the numbers together, and all the variables

-(-1b+15)+27=0

We get rid of parentheses

1b-15+27=0

We add all the numbers together, and all the variables

b+12=0

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

b=-12

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