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21=h/7+16
We move all terms to the left:
21-(h/7+16)=0
We get rid of parentheses
-h/7-16+21=0
We multiply all the terms by the denominator
-h-16*7+21*7=0
We add all the numbers together, and all the variables
-1h+35=0
We move all terms containing h to the left, all other terms to the right
-h=-35
h=-35/-1
h=+35
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