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21=5h-9
We move all terms to the left:
21-(5h-9)=0
We get rid of parentheses
-5h+9+21=0
We add all the numbers together, and all the variables
-5h+30=0
We move all terms containing h to the left, all other terms to the right
-5h=-30
h=-30/-5
h=+6
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