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30=0.5(7+5)h
We move all terms to the left:
30-(0.5(7+5)h)=0
We add all the numbers together, and all the variables
-(0.512h)+30=0
We get rid of parentheses
-0.512h+30=0
We move all terms containing h to the left, all other terms to the right
-0.512h=-30
h=-30/-0.512
h=58+0.304/0.512
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