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-h-(-2h)=-10
We move all terms to the left:
-h-(-2h)-(-10)=0
We add all the numbers together, and all the variables
-1h-(-2h)+10=0
We get rid of parentheses
-1h+2h+10=0
We add all the numbers together, and all the variables
h+10=0
We move all terms containing h to the left, all other terms to the right
h=-10
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