(5-x)/(3+x)=13/12

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Solution for (5-x)/(3+x)=13/12 equation: 


D( x )

x+3 = 0

x+3 = 0

x+3 = 0

x+3 = 0 // - 3

x = -3

x in (-oo:-3) U (-3:+oo)

(5-x)/(x+3) = 13/12 // - 13/12

(5-x)/(x+3)-(13/12) = 0

(5-x)/(x+3)-13/12 = 0

(12*(5-x))/(12*(x+3))+(-13*(x+3))/(12*(x+3)) = 0

12*(5-x)-13*(x+3) = 0

21-25*x = 0

(21-25*x)/(12*(x+3)) = 0

(21-25*x)/(12*(x+3)) = 0 // * 12*(x+3)

21-25*x = 0

21-25*x = 0 // - 21

-25*x = -21 // : -25

x = -21/(-25)

x = 21/25

x = 21/25

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