(9-5)/9=(15-k)/15

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Solution for (9-5)/9=(15-k)/15 equation: 


k in (-oo:+oo)

(9-5)/9 = (15-k)/15 // - (15-k)/15

(9-5)/9-((15-k)/15) = 0

(-1*(15-k))/15+4/9 = 0

(-1*9*(15-k))/(9*15)+(4*15)/(9*15) = 0

4*15-1*9*(15-k) = 0

9*k-75 = 0

(9*k-75)/(9*15) = 0

(9*k-75)/(9*15) = 0 // * 9*15

9*k-75 = 0

9*k-75 = 0 // + 75

9*k = 75 // : 9

k = 75/9

k = 25/3

k = 25/3

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