(-1/2)=(5-(-1))/(-4-x)

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Solution for (-1/2)=(5-(-1))/(-4-x) equation: 


D( x )

-x-4 = 0

-x-4 = 0

-x-4 = 0

-x-4 = 0 // + 4

-x = 4 // * -1

x = -4

x in (-oo:-4) U (-4:+oo)

-1/2 = (1+5)/(-x-4) // - (1+5)/(-x-4)

-((1+5)/(-x-4))-1/2 = 0

(-1*6)/(-x-4)-1/2 = 0

(-1*2*6)/(2*(-x-4))+(-1*(-x-4))/(2*(-x-4)) = 0

-1*(-x-4)-1*2*6 = 0

x-8 = 0

(x-8)/(2*(-x-4)) = 0

(x-8)/(2*(-x-4)) = 0 // * 2*(-x-4)

x-8 = 0

x-8 = 0 // + 8

x = 8

x = 8

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