-12/(x-3)=4/(x+5)

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Solution for -12/(x-3)=4/(x+5) equation: 


D( x )

x+5 = 0

x-3 = 0

x+5 = 0

x+5 = 0

x+5 = 0 // - 5

x = -5

x-3 = 0

x-3 = 0

x-3 = 0 // + 3

x = 3

x in (-oo:-5) U (-5:3) U (3:+oo)

-12/(x-3) = 4/(x+5) // - 4/(x+5)

-12/(x-3)-(4/(x+5)) = 0

-12/(x-3)-4*(x+5)^-1 = 0

-12/(x-3)-4/(x+5) = 0

(-12*(x+5))/((x-3)*(x+5))+(-4*(x-3))/((x-3)*(x+5)) = 0

-12*(x+5)-4*(x-3) = 0

-16*x-48 = 0

(-16*x-48)/((x-3)*(x+5)) = 0

(-16*x-48)/((x-3)*(x+5)) = 0 // * (x-3)*(x+5)

-16*x-48 = 0

-16*x-48 = 0 // + 48

-16*x = 48 // : -16

x = 48/(-16)

x = -3

x = -3

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