10b+21=891

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Solution for 10b+21=891 equation: 



10b+21=891

We move all terms to the left:

10b+21-(891)=0

We add all the numbers together, and all the variables

10b-870=0

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

10b=870

b=870/10

b=87

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