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40/f=10
We move all terms to the left:
40/f-(10)=0
Domain of the equation: f!=0We multiply all the terms by the denominator
f∈R
-10*f+40=0
We add all the numbers together, and all the variables
-10f+40=0
We move all terms containing f to the left, all other terms to the right
-10f=-40
f=-40/-10
f=+4
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