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240=12h+42
We move all terms to the left:
240-(12h+42)=0
We get rid of parentheses
-12h-42+240=0
We add all the numbers together, and all the variables
-12h+198=0
We move all terms containing h to the left, all other terms to the right
-12h=-198
h=-198/-12
h=16+1/2
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