(x+3)/(x+13)=3/5

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Solution for (x+3)/(x+13)=3/5 equation: 


D( x )

x+13 = 0

x+13 = 0

x+13 = 0

x+13 = 0 // - 13

x = -13

x in (-oo:-13) U (-13:+oo)

(x+3)/(x+13) = 3/5 // - 3/5

(x+3)/(x+13)-(3/5) = 0

(x+3)/(x+13)-3/5 = 0

(5*(x+3))/(5*(x+13))+(-3*(x+13))/(5*(x+13)) = 0

5*(x+3)-3*(x+13) = 0

2*x-24 = 0

(2*x-24)/(5*(x+13)) = 0

(2*x-24)/(5*(x+13)) = 0 // * 5*(x+13)

2*x-24 = 0

2*x-24 = 0 // + 24

2*x = 24 // : 2

x = 24/2

x = 12

x = 12

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