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-11h-(-10h)=-20
We move all terms to the left:
-11h-(-10h)-(-20)=0
We add all the numbers together, and all the variables
-11h-(-10h)+20=0
We get rid of parentheses
-11h+10h+20=0
We add all the numbers together, and all the variables
-1h+20=0
We move all terms containing h to the left, all other terms to the right
-h=-20
h=-20/-1
h=+20
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