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x in (-oo:+oo)
(1/6)*(-5*x-8) = 0
1/6*(-5*x-8) = 0
( -5*x-8 )
-5*x-8 = 0 // + 8
-5*x = 8 // : -5
x = 8/(-5)
x = -8/5
( 1/6 )
1/6 = 0
x belongs to the empty set
x = -8/5
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