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7-9(-h-19)=-2h-20
We move all terms to the left:
7-9(-h-19)-(-2h-20)=0
We add all the numbers together, and all the variables
-9(-1h-19)-(-2h-20)+7=0
We multiply parentheses
9h-(-2h-20)+171+7=0
We get rid of parentheses
9h+2h+20+171+7=0
We add all the numbers together, and all the variables
11h+198=0
We move all terms containing h to the left, all other terms to the right
11h=-198
h=-198/11
h=-18
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