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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
w/8+3/x = 3 // - 3
w/8+3/x-3 = 0
3*x^-1 = -(1/8*w-3) // : 3
x^-1 = (3-(1/8*w))/3
-1 < 0
1/(x^1) = (3-(1/8*w))/3 // * x^1
1 = x^1*((3-(1/8*w))/3) // : (3-(1/8*w))/3
3*(3-1/8*w)^-1 = x^1
x = 3*(3-1/8*w)^-1
x = 3*(3-1/8*w)^-1
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