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x in (-oo:+oo)
(4/5)*(-2/10)*x = 1 // - 1
(4/5)*(-2/10)*x-1 = 0
-4/25*x-1 = 0 // + 1
-4/25*x = 1 // : -4/25
x = 1/(-4/25)
x = -25/4
x = -25/4
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