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28=7+3h
We move all terms to the left:
28-(7+3h)=0
We add all the numbers together, and all the variables
-(3h+7)+28=0
We get rid of parentheses
-3h-7+28=0
We add all the numbers together, and all the variables
-3h+21=0
We move all terms containing h to the left, all other terms to the right
-3h=-21
h=-21/-3
h=+7
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