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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/2-(1/x) = (6*x+5)/12 // - (6*x+5)/12
x/2-((6*x+5)/12)-(1/x) = 0
x/2-((6*x+5)/12)-x^-1 = 0
(-1*(6*x+5))/12+x/2-1/x = 0
(-1*2*x*(6*x+5))/(2*12*x)+(12*x^2)/(2*12*x)+(-1*2*12)/(2*12*x) = 0
12*x^2-1*2*x*(6*x+5)-1*2*12 = 0
-10*x-24 = 0
(-10*x-24)/(2*12*x) = 0
(-10*x-24)/(2*12*x) = 0 // * 2*12*x
-10*x-24 = 0
-10*x-24 = 0 // + 24
-10*x = 24 // : -10
x = 24/(-10)
x = -12/5
x = -12/5
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