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3=2h-9
We move all terms to the left:
3-(2h-9)=0
We get rid of parentheses
-2h+9+3=0
We add all the numbers together, and all the variables
-2h+12=0
We move all terms containing h to the left, all other terms to the right
-2h=-12
h=-12/-2
h=+6
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