90/(f-1)=15

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Solution for 90/(f-1)=15 equation: 


D( f )

f-1 = 0

f-1 = 0

f-1 = 0

f-1 = 0 // + 1

f = 1

f in (-oo:1) U (1:+oo)

90/(f-1) = 15 // - 15

90/(f-1)-15 = 0

90/(f-1)+(-15*(f-1))/(f-1) = 0

90-15*(f-1) = 0

105-15*f = 0

(105-15*f)/(f-1) = 0

(105-15*f)/(f-1) = 0 // * f-1

105-15*f = 0

105-15*f = 0 // - 105

-15*f = -105 // : -15

f = -105/(-15)

f = 7

f = 7

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