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15h+5h=7h+12
We move all terms to the left:
15h+5h-(7h+12)=0
We add all the numbers together, and all the variables
20h-(7h+12)=0
We get rid of parentheses
20h-7h-12=0
We add all the numbers together, and all the variables
13h-12=0
We move all terms containing h to the left, all other terms to the right
13h=12
h=12/13
h=12/13
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