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13=21/h+10
We move all terms to the left:
13-(21/h+10)=0
Domain of the equation: h+10)!=0We get rid of parentheses
h∈R
-21/h-10+13=0
We multiply all the terms by the denominator
-10*h+13*h-21=0
We add all the numbers together, and all the variables
3h-21=0
We move all terms containing h to the left, all other terms to the right
3h=21
h=21/3
h=7
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