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21=5+b/2
We move all terms to the left:
21-(5+b/2)=0
We add all the numbers together, and all the variables
-(b/2+5)+21=0
We get rid of parentheses
-b/2-5+21=0
We multiply all the terms by the denominator
-b-5*2+21*2=0
We add all the numbers together, and all the variables
-1b+32=0
We move all terms containing b to the left, all other terms to the right
-b=-32
b=-32/-1
b=+32
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