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-(4h+9)=12
We move all terms to the left:
-(4h+9)-(12)=0
We get rid of parentheses
-4h-9-12=0
We add all the numbers together, and all the variables
-4h-21=0
We move all terms containing h to the left, all other terms to the right
-4h=21
h=21/-4
h=-5+1/4
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