B-3=-15-b

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Solution for B-3=-15-b equation: 



-3=-15-B

We move all terms to the left:

-3-(-15-B)=0

We add all the numbers together, and all the variables

-(-1B-15)-3=0

We get rid of parentheses

1B+15-3=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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