21=b/3-10

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Solution for 21=b/3-10 equation: 



21=b/3-10

We move all terms to the left:

21-(b/3-10)=0

We get rid of parentheses

-b/3+10+21=0

We multiply all the terms by the denominator


-b+10*3+21*3=0

We add all the numbers together, and all the variables

-1b+93=0

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

-b=-93

b=-93/-1

b=+93

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