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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