18/4.5=8/f

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Solution for 18/4.5=8/f equation: 


D( f )

f = 0

f = 0

f = 0

f in (-oo:0) U (0:+oo)

18/4.5 = 8/f // - 8/f

18/4.5-(8/f) = 0

18/4.5-8*f^-1 = 0

-8*f^-1 = -4 // : -8

f^-1 = 1/2

-1 < 0

1/(f^1) = 1/2 // * f^1

1 = 1/2*f^1 // : 1/2

2 = f^1

f = 2

f = 2

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