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D( x )
x = 0
x-3 = 0
x = 0
x = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:0) U (0:3) U (3:+oo)
7/x-(2/(x-3)) = 6/x // - 6/x
7/x-(2/(x-3))-(6/x) = 0
7/x-2*(x-3)^-1-6*x^-1 = 0
7/x-2/(x-3)-6/x = 0
(-2*x)/(x*(x-3))+(7*(x-3))/(x*(x-3))+(-6*(x-3))/(x*(x-3)) = 0
7*(x-3)-6*(x-3)-2*x = 0
5*x-6*x-21+18 = 0
-x-3 = 0
(-x-3)/(x*(x-3)) = 0
(-x-3)/(x*(x-3)) = 0 // * x*(x-3)
-x-3 = 0
-x-3 = 0 // + 3
-x = 3 // * -1
x = -3
x = -3
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