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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
x/(x+2) = 3/(x+2)+6 // - 3/(x+2)+6
x/(x+2)-(3/(x+2))-6 = 0
x/(x+2)-3*(x+2)^-1-6 = 0
x/(x+2)-3/(x+2)-6 = 0
x/(x+2)-3/(x+2)+(-6*(x+2))/(x+2) = 0
x-6*(x+2)-3 = 0
x-6*x-12-3 = 0
-5*x-15 = 0
(-5*x-15)/(x+2) = 0
(-5*x-15)/(x+2) = 0 // * x+2
-5*x-15 = 0
-5*x-15 = 0 // + 15
-5*x = 15 // : -5
x = 15/(-5)
x = -3
x = -3
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