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42=9h-3
We move all terms to the left:
42-(9h-3)=0
We get rid of parentheses
-9h+3+42=0
We add all the numbers together, and all the variables
-9h+45=0
We move all terms containing h to the left, all other terms to the right
-9h=-45
h=-45/-9
h=+5
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