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20+10h+20=-20+20h
We move all terms to the left:
20+10h+20-(-20+20h)=0
We add all the numbers together, and all the variables
10h-(20h-20)+20+20=0
We add all the numbers together, and all the variables
10h-(20h-20)+40=0
We get rid of parentheses
10h-20h+20+40=0
We add all the numbers together, and all the variables
-10h+60=0
We move all terms containing h to the left, all other terms to the right
-10h=-60
h=-60/-10
h=+6
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