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9f=1/2(12f-12
We move all terms to the left:
9f-(1/2(12f-12)=0
Domain of the equation: 2(12f-12)!=0We multiply all the terms by the denominator
f∈R
9f*2(12f-12)-(1=0
We add all the numbers together, and all the variables
9f*2(12f-12)=0
Wy multiply elements
18f^2(1=0
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