\left\{ \begin{array} { l } { N = 5 } \\ { f m = 40 } \end{array} \right.
Solve for N, f, m
N=5
f=\frac{40}{m}
m\neq 0
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\left\{ \begin{array} { l } { N = 5 } \\ { f m = 40 } \end{array} \right.
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