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18=0.75h.h=12
We move all terms to the left:
18-(0.75h.h)=0
We add all the numbers together, and all the variables
-(+0.75h.h)+18=0
We get rid of parentheses
-0.75h.h+18=0
We move all terms containing h to the left, all other terms to the right
-0.75h.h=-18
h=-18/1
h=-18
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