Solving the equation for f will give us:
[tex]f = 4HR - NR[/tex]
[tex]\frac{f}{R} = 4H - N[/tex] (given)
[tex]\frac{f}{R} \times R = (4H - N) \times R[/tex] (Multiplication property of equality)
[tex]f = 4HR - NR[/tex]
Therefore, solving the given equation for f, we will have:
[tex]f = 4HR - NR[/tex]
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