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10h+9=-h-10
We move all terms to the left:
10h+9-(-h-10)=0
We add all the numbers together, and all the variables
10h-(-1h-10)+9=0
We get rid of parentheses
10h+1h+10+9=0
We add all the numbers together, and all the variables
11h+19=0
We move all terms containing h to the left, all other terms to the right
11h=-19
h=-19/11
h=-1+8/11
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