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13=3h+9
We move all terms to the left:
13-(3h+9)=0
We get rid of parentheses
-3h-9+13=0
We add all the numbers together, and all the variables
-3h+4=0
We move all terms containing h to the left, all other terms to the right
-3h=-4
h=-4/-3
h=1+1/3
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