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19-20h=-7-11h-12h
We move all terms to the left:
19-20h-(-7-11h-12h)=0
We add all the numbers together, and all the variables
-20h-(-23h-7)+19=0
We get rid of parentheses
-20h+23h+7+19=0
We add all the numbers together, and all the variables
3h+26=0
We move all terms containing h to the left, all other terms to the right
3h=-26
h=-26/3
h=-8+2/3
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