7/f=5/15

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Solution for 7/f=5/15 equation: 


D( f )

f = 0

f = 0

f = 0

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

7/f = 5/15 // - 5/15

7/f-(5/15) = 0

7/f-1/3 = 0

7*f^-1 = 1/3 // : 7

f^-1 = 1/21

-1 < 0

1/(f^1) = 1/21 // * f^1

1 = 1/21*f^1 // : 1/21

21 = f^1

f = 21

f = 21

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