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21=b/6+16
We move all terms to the left:
21-(b/6+16)=0
We get rid of parentheses
-b/6-16+21=0
We multiply all the terms by the denominator
-b-16*6+21*6=0
We add all the numbers together, and all the variables
-1b+30=0
We move all terms containing b to the left, all other terms to the right
-b=-30
b=-30/-1
b=+30
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