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1/8f=9
We move all terms to the left:
1/8f-(9)=0
Domain of the equation: 8f!=0We multiply all the terms by the denominator
f!=0/8
f!=0
f∈R
-9*8f+1=0
Wy multiply elements
-72f+1=0
We move all terms containing f to the left, all other terms to the right
-72f=-1
f=-1/-72
f=1/72
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