21=12b-7+4b

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Solution for 21=12b-7+4b equation: 



21=12b-7+4b

We move all terms to the left:

21-(12b-7+4b)=0

We add all the numbers together, and all the variables

-(16b-7)+21=0

We get rid of parentheses

-16b+7+21=0

We add all the numbers together, and all the variables

-16b+28=0

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

-16b=-28

b=-28/-16

b=1+3/4

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