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-4h+9+12h=-11+13h
We move all terms to the left:
-4h+9+12h-(-11+13h)=0
We add all the numbers together, and all the variables
-4h+12h-(13h-11)+9=0
We add all the numbers together, and all the variables
8h-(13h-11)+9=0
We get rid of parentheses
8h-13h+11+9=0
We add all the numbers together, and all the variables
-5h+20=0
We move all terms containing h to the left, all other terms to the right
-5h=-20
h=-20/-5
h=+4
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