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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)
(2*x)/(x+3)-(6/(x+5)) = 2 // - 2
(2*x)/(x+3)-(6/(x+5))-2 = 0
(2*x)/(x+3)-6*(x+5)^-1-2 = 0
(2*x)/(x+3)-6/(x+5)-2 = 0
(2*x*(x+5))/((x+3)*(x+5))+(-6*(x+3))/((x+3)*(x+5))+(-2*(x+3)*(x+5))/((x+3)*(x+5)) = 0
2*x*(x+5)-6*(x+3)-2*(x+3)*(x+5) = 0
2*x^2-2*x^2+4*x-16*x-30-18 = 0
-12*x-48 = 0
(-12*x-48)/((x+3)*(x+5)) = 0
(-12*x-48)/((x+3)*(x+5)) = 0 // * (x+3)*(x+5)
-12*x-48 = 0
-12*x-48 = 0 // + 48
-12*x = 48 // : -12
x = 48/(-12)
x = -4
x = -4
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