21-6b=-51

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Solution for 21-6b=-51 equation: 



21-6b=-51

We move all terms to the left:

21-6b-(-51)=0

We add all the numbers together, and all the variables

-6b+72=0

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

-6b=-72

b=-72/-6

b=+12

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