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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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