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6.4=h+8.7
We move all terms to the left:
6.4-(h+8.7)=0
We get rid of parentheses
-h-8.7+6.4=0
We add all the numbers together, and all the variables
-1h-2.3=0
We move all terms containing h to the left, all other terms to the right
-h=2.3
h=2.3/-1
h=-2+0.3/1
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