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5h+3h+4.5h=12.5
We move all terms to the left:
5h+3h+4.5h-(12.5)=0
We add all the numbers together, and all the variables
12.5h-12.5=0
We move all terms containing h to the left, all other terms to the right
12.5h=12.5
h=12.5/12.5
h=1
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