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12-0.5h=18-0.2h
We move all terms to the left:
12-0.5h-(18-0.2h)=0
We add all the numbers together, and all the variables
-0.5h-(-0.2h+18)+12=0
We get rid of parentheses
-0.5h+0.2h-18+12=0
We add all the numbers together, and all the variables
-0.3h-6=0
We move all terms containing h to the left, all other terms to the right
-0.3h=6
h=6/-0.3
h=-20
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