Simply substitute -1 to m in the equation.
[tex]f(m) = 2m + \frac{1}{3} \\ f( - 1) = 2( - 1) + \frac{1}{3} \\ f( - 1) = - 2 + \frac{1}{3} \\ f( - 1) = - 1 \frac{2}{3} [/tex]
Therefore,
[tex]f( - 1) = - 1 \frac{2}{3} [/tex]
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