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0=0.8h+12
We move all terms to the left:
0-(0.8h+12)=0
We add all the numbers together, and all the variables
-(0.8h+12)=0
We get rid of parentheses
-0.8h-12=0
We move all terms containing h to the left, all other terms to the right
-0.8h=12
h=12/-0.8
h=-15
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