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-8h=-7h+9
We move all terms to the left:
-8h-(-7h+9)=0
We get rid of parentheses
-8h+7h-9=0
We add all the numbers together, and all the variables
-1h-9=0
We move all terms containing h to the left, all other terms to the right
-h=9
h=9/-1
h=-9
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