y/(16.9-y)=4/20

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Solution for y/(16.9-y)=4/20 equation: 


D( y )

16.9-y = 0

16.9-y = 0

16.9-y = 0

16.9-y = 0 // - 16.9

-y = -16.9 // * -1

y = 16.9

y in (-oo:16.9) U (16.9:+oo)

y/(16.9-y) = 4/20 // - 4/20

y/(16.9-y)-(4/20) = 0

y/(16.9-y)-1/5 = 0

(5*y)/(5*(16.9-y))+(-1*(16.9-y))/(5*(16.9-y)) = 0

5*y-1*(16.9-y) = 0

6*y-16.9 = 0

(6*y-16.9)/(5*(16.9-y)) = 0

(6*y-16.9)/(5*(16.9-y)) = 0 // * 5*(16.9-y)

6*y-16.9 = 0

6*y-16.9 = 0 // + 16.9

6*y = 16.9 // : 6

y = 16.9/6

y = 2.81666667

y = 2.81666667

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