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2(h-8)+2h=20
We move all terms to the left:
2(h-8)+2h-(20)=0
We add all the numbers together, and all the variables
2h+2(h-8)-20=0
We multiply parentheses
2h+2h-16-20=0
We add all the numbers together, and all the variables
4h-36=0
We move all terms containing h to the left, all other terms to the right
4h=36
h=36/4
h=9
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