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40.8=3.4h
We move all terms to the left:
40.8-(3.4h)=0
We add all the numbers together, and all the variables
-(+3.4h)+40.8=0
We get rid of parentheses
-3.4h+40.8=0
We move all terms containing h to the left, all other terms to the right
-3.4h=-40.8
h=-40.8/-3.4
h=+12
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