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D( x )
x = 0
x+8 = 0
x = 0
x = 0
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:0) U (0:+oo)
(12*x)/x-((x+6)/(x+8))-10 = 0
(-1*(x+6))/(x+8)-10+12 = 0
(-1*(x+6))/(x+8)+(12*(x+8))/(x+8)+(-10*(x+8))/(x+8) = 0
12*(x+8)-1*(x+6)-10*(x+8) = 0
11*x-10*x-80+90 = 0
x+10 = 0
(x+10)/(x+8) = 0
(x+10)/(x+8) = 0 // * x+8
x+10 = 0
x+10 = 0 // - 10
x = -10
x = -10
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