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19=2h+9
We move all terms to the left:
19-(2h+9)=0
We get rid of parentheses
-2h-9+19=0
We add all the numbers together, and all the variables
-2h+10=0
We move all terms containing h to the left, all other terms to the right
-2h=-10
h=-10/-2
h=+5
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