6b-21=81

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Solution for 6b-21=81 equation: 



6b-21=81

We move all terms to the left:

6b-21-(81)=0

We add all the numbers together, and all the variables

6b-102=0

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

6b=102

b=102/6

b=17

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