15-3b=21

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Solution for 15-3b=21 equation: 



15-3b=21

We move all terms to the left:

15-3b-(21)=0

We add all the numbers together, and all the variables

-3b-6=0

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

-3b=6

b=6/-3

b=-2

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