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2(h+8)-h=3h-12
We move all terms to the left:
2(h+8)-h-(3h-12)=0
We add all the numbers together, and all the variables
-1h+2(h+8)-(3h-12)=0
We multiply parentheses
-1h+2h-(3h-12)+16=0
We get rid of parentheses
-1h+2h-3h+12+16=0
We add all the numbers together, and all the variables
-2h+28=0
We move all terms containing h to the left, all other terms to the right
-2h=-28
h=-28/-2
h=+14
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