(n-9)/(n+5)=7/4

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Solution for (n-9)/(n+5)=7/4 equation: 


D( n )

n+5 = 0

n+5 = 0

n+5 = 0

n+5 = 0 // - 5

n = -5

n in (-oo:-5) U (-5:+oo)

(n-9)/(n+5) = 7/4 // - 7/4

(n-9)/(n+5)-(7/4) = 0

(n-9)/(n+5)-7/4 = 0

(4*(n-9))/(4*(n+5))+(-7*(n+5))/(4*(n+5)) = 0

4*(n-9)-7*(n+5) = 0

-3*n-71 = 0

(-3*n-71)/(4*(n+5)) = 0

(-3*n-71)/(4*(n+5)) = 0 // * 4*(n+5)

-3*n-71 = 0

-3*n-71 = 0 // + 71

-3*n = 71 // : -3

n = 71/(-3)

n = -71/3

n = -71/3

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