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20-11h=-20-13h
We move all terms to the left:
20-11h-(-20-13h)=0
We add all the numbers together, and all the variables
-11h-(-13h-20)+20=0
We get rid of parentheses
-11h+13h+20+20=0
We add all the numbers together, and all the variables
2h+40=0
We move all terms containing h to the left, all other terms to the right
2h=-40
h=-40/2
h=-20
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