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h+2(6+h)=30
We move all terms to the left:
h+2(6+h)-(30)=0
We add all the numbers together, and all the variables
h+2(h+6)-30=0
We multiply parentheses
h+2h+12-30=0
We add all the numbers together, and all the variables
3h-18=0
We move all terms containing h to the left, all other terms to the right
3h=18
h=18/3
h=6
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