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12h+19=15h-20
We move all terms to the left:
12h+19-(15h-20)=0
We get rid of parentheses
12h-15h+20+19=0
We add all the numbers together, and all the variables
-3h+39=0
We move all terms containing h to the left, all other terms to the right
-3h=-39
h=-39/-3
h=+13
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