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13h+20=-20+10h-20
We move all terms to the left:
13h+20-(-20+10h-20)=0
We add all the numbers together, and all the variables
13h-(10h-40)+20=0
We get rid of parentheses
13h-10h+40+20=0
We add all the numbers together, and all the variables
3h+60=0
We move all terms containing h to the left, all other terms to the right
3h=-60
h=-60/3
h=-20
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