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x in (-oo:+oo)
(5*x+8)/6 = (x+8)/(-2) // - (x+8)/(-2)
(5*x+8)/6-((x+8)/(-2)) = 0
(5*x+8)/6+(-1*(x+8))/(-2) = 0
(-2*(5*x+8))/(-2*6)+(-1*6*(x+8))/(-2*6) = 0
-2*(5*x+8)-1*6*(x+8) = 0
-16*x-64 = 0
(-16*x-64)/(-2*6) = 0
(-16*x-64)/(-2*6) = 0 // * -2*6
-16*x-64 = 0
-16*x-64 = 0 // + 64
-16*x = 64 // : -16
x = 64/(-16)
x = -4
x = -4
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