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-1/7f=15
We move all terms to the left:
-1/7f-(15)=0
Domain of the equation: 7f!=0We multiply all the terms by the denominator
f!=0/7
f!=0
f∈R
-15*7f-1=0
Wy multiply elements
-105f-1=0
We move all terms containing f to the left, all other terms to the right
-105f=1
f=1/-105
f=-1/105
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