21=b/2+12

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Solution for 21=b/2+12 equation: 



21=b/2+12

We move all terms to the left:

21-(b/2+12)=0

We get rid of parentheses

-b/2-12+21=0

We multiply all the terms by the denominator


-b-12*2+21*2=0

We add all the numbers together, and all the variables

-1b+18=0

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

-b=-18

b=-18/-1

b=+18

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