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f\left(-\frac{1}{3}\right)=\frac{3\left(-\frac{1}{3}-\frac{3}{3}\right)}{2\left(-\frac{1}{3}\right)+1}
Convert 1 to fraction \frac{3}{3}.
f\left(-\frac{1}{3}\right)=\frac{3\times \frac{-1-3}{3}}{2\left(-\frac{1}{3}\right)+1}
Since -\frac{1}{3} and \frac{3}{3} have the same denominator, subtract them by subtracting their numerators.
f\left(-\frac{1}{3}\right)=\frac{3\left(-\frac{4}{3}\right)}{2\left(-\frac{1}{3}\right)+1}
Subtract 3 from -1 to get -4.
f\left(-\frac{1}{3}\right)=\frac{-4}{2\left(-\frac{1}{3}\right)+1}
Cancel out 3 and 3.
f\left(-\frac{1}{3}\right)=\frac{-4}{\frac{2\left(-1\right)}{3}+1}
Express 2\left(-\frac{1}{3}\right) as a single fraction.
f\left(-\frac{1}{3}\right)=\frac{-4}{\frac{-2}{3}+1}
Multiply 2 and -1 to get -2.
f\left(-\frac{1}{3}\right)=\frac{-4}{-\frac{2}{3}+1}
Fraction \frac{-2}{3} can be rewritten as -\frac{2}{3} by extracting the negative sign.
f\left(-\frac{1}{3}\right)=\frac{-4}{-\frac{2}{3}+\frac{3}{3}}
Convert 1 to fraction \frac{3}{3}.
f\left(-\frac{1}{3}\right)=\frac{-4}{\frac{-2+3}{3}}
Since -\frac{2}{3} and \frac{3}{3} have the same denominator, add them by adding their numerators.
f\left(-\frac{1}{3}\right)=\frac{-4}{\frac{1}{3}}
Add -2 and 3 to get 1.
f\left(-\frac{1}{3}\right)=-4\times 3
Divide -4 by \frac{1}{3} by multiplying -4 by the reciprocal of \frac{1}{3}.
f\left(-\frac{1}{3}\right)=-12
Multiply -4 and 3 to get -12.
f=-12\left(-3\right)
Multiply both sides by -3, the reciprocal of -\frac{1}{3}.
f=36
Multiply -12 and -3 to get 36.