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x in (-oo:+oo)
(5/4)*(-8*x-6) = -1 // + 1
(5/4)*(-8*x-6)+1 = 0
5/4*(-8*x-6)+1 = 0
5/4*(-8*x-6)+1 = 0
-10*x-13/2 = 0
-10*x-13/2 = 0
-10*x-13/2 = 0 // + 13/2
-10*x = 13/2 // : -10
x = 13/2/(-10)
x = -13/20
x = -13/20
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