6b+21=99

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Solution for 6b+21=99 equation: 



6b+21=99

We move all terms to the left:

6b+21-(99)=0

We add all the numbers together, and all the variables

6b-78=0

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

6b=78

b=78/6

b=13

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