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72/2h=4
We move all terms to the left:
72/2h-(4)=0
Domain of the equation: 2h!=0We multiply all the terms by the denominator
h!=0/2
h!=0
h∈R
-4*2h+72=0
Wy multiply elements
-8h+72=0
We move all terms containing h to the left, all other terms to the right
-8h=-72
h=-72/-8
h=+9
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