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-(h-90)=12
We move all terms to the left:
-(h-90)-(12)=0
We get rid of parentheses
-h+90-12=0
We add all the numbers together, and all the variables
-1h+78=0
We move all terms containing h to the left, all other terms to the right
-h=-78
h=-78/-1
h=+78
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