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x in (-oo:+oo)
(4/(-5))*x = 17 // - 17
(4/(-5))*x-17 = 0
-4/5*x-17 = 0 // + 17
-4/5*x = 17 // : -4/5
x = 17/(-4/5)
x = -85/4
x = -85/4
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