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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-8/6)*x-12 = x+(3/3)*x+(2*x)/x-6-2 // - x+(3/3)*x+(2*x)/x-6-2
(-8/6)*x-x-((3/3)*x)-((2*x)/x)-12+2+6 = 0
(-8/6)*x-x-x-12-2+2+6 = 0
-10/3*x-6 = 0 // + 6
-10/3*x = 6 // : -10/3
x = 6/(-10/3)
x = -9/5
x = -9/5
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