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-2(h-3)=20
We move all terms to the left:
-2(h-3)-(20)=0
We multiply parentheses
-2h+6-20=0
We add all the numbers together, and all the variables
-2h-14=0
We move all terms containing h to the left, all other terms to the right
-2h=14
h=14/-2
h=-7
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