Easy
Solve for f{f}f.
9f=12(12f−2)9 f=\frac{1}{2}(12 f-2)9f=21(12f−2)
−13-\frac{1}{3}−31
13\frac{1}{3}31
12\frac{1}{2}21
−12-\frac{1}{2}−21
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