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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40/x+6 = 8/3 // - 8/3
40/x-(8/3)+6 = 0
40/x-8/3+6 = 0
40*x^-1 = -10/3 // : 40
x^-1 = -1/12
-1 < 0
1/(x^1) = -1/12 // * x^1
1 = -1/12*x^1 // : -1/12
-12 = x^1
x = -12
x = -12
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