(9/5n-3)/(5n-5)=7/20

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Solution for (9/5n-3)/(5n-5)=7/20 equation: 


D( n )

5*n-5 = 0

5*n-5 = 0

5*n-5 = 0

5*n-5 = 0 // + 5

5*n = 5 // : 5

n = 5/5

n = 1

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

((9/5)*n-3)/(5*n-5) = 7/20 // - 7/20

((9/5)*n-3)/(5*n-5)-(7/20) = 0

((9/5)*n-3)/(5*n-5)-7/20 = 0

(9/5*n-3)/(5*n-5)-7/20 = 0

(20*(9/5*n-3))/(20*(5*n-5))+(-7*(5*n-5))/(20*(5*n-5)) = 0

20*(9/5*n-3)-7*(5*n-5) = 0

n-25 = 0

(n-25)/(20*(5*n-5)) = 0

(n-25)/(20*(5*n-5)) = 0 // * 20*(5*n-5)

n-25 = 0

n-25 = 0 // + 25

n = 25

n = 25

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