-b-15=21

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Solution for -b-15=21 equation: 



-b-15=21

We move all terms to the left:

-b-15-(21)=0

We add all the numbers together, and all the variables

-1b-36=0

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

-b=36

b=36/-1

b=-36

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