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9=h+8.6
We move all terms to the left:
9-(h+8.6)=0
We get rid of parentheses
-h-8.6+9=0
We add all the numbers together, and all the variables
-1h+0.4=0
We move all terms containing h to the left, all other terms to the right
-h=-0.4
h=-0.4/-1
h=0.4/1
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