(7-x)/(15-x)=1/5

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Solution for (7-x)/(15-x)=1/5 equation: 


D( x )

15-x = 0

15-x = 0

15-x = 0

15-x = 0 // - 15

-x = -15 // * -1

x = 15

x in (-oo:15) U (15:+oo)

(7-x)/(15-x) = 1/5 // - 1/5

(7-x)/(15-x)-(1/5) = 0

(7-x)/(15-x)-1/5 = 0

(5*(7-x))/(5*(15-x))+(-1*(15-x))/(5*(15-x)) = 0

5*(7-x)-1*(15-x) = 0

20-4*x = 0

(20-4*x)/(5*(15-x)) = 0

(20-4*x)/(5*(15-x)) = 0 // * 5*(15-x)

20-4*x = 0

20-4*x = 0 // - 20

-4*x = -20 // : -4

x = -20/(-4)

x = 5

x = 5

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