4/(15-x)=1/2

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Solution for 4/(15-x)=1/2 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)

4/(15-x) = 1/2 // - 1/2

4/(15-x)-(1/2) = 0

4/(15-x)-1/2 = 0

(2*4)/(2*(15-x))+(-1*(15-x))/(2*(15-x)) = 0

2*4-1*(15-x) = 0

x-7 = 0

(x-7)/(2*(15-x)) = 0

(x-7)/(2*(15-x)) = 0 // * 2*(15-x)

x-7 = 0

x-7 = 0 // + 7

x = 7

x = 7

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