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2h-4(3+h)=20
We move all terms to the left:
2h-4(3+h)-(20)=0
We add all the numbers together, and all the variables
2h-4(h+3)-20=0
We multiply parentheses
2h-4h-12-20=0
We add all the numbers together, and all the variables
-2h-32=0
We move all terms containing h to the left, all other terms to the right
-2h=32
h=32/-2
h=-16
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