9b+-12=-21

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Solution for 9b+-12=-21 equation: 



9b+-12=-21

We move all terms to the left:

9b+-12-(-21)=0

We add all the numbers together, and all the variables

9b+9=0

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

9b=-9

b=-9/9

b=-1

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