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