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-2(h+12)+3(2h-4)=40
We move all terms to the left:
-2(h+12)+3(2h-4)-(40)=0
We multiply parentheses
-2h+6h-24-12-40=0
We add all the numbers together, and all the variables
4h-76=0
We move all terms containing h to the left, all other terms to the right
4h=76
h=76/4
h=19
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