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9-8h=-7h-1
We move all terms to the left:
9-8h-(-7h-1)=0
We get rid of parentheses
-8h+7h+1+9=0
We add all the numbers together, and all the variables
-1h+10=0
We move all terms containing h to the left, all other terms to the right
-h=-10
h=-10/-1
h=+10
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