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x in (-oo:+oo)
(3*x)/(-1) = 5 // - 5
(3*x)/(-1)-5 = 0
-3*x-5 = 0
-3*x-5 = 0 // + 5
-3*x = 5 // : -3
x = 5/(-3)
x = -5/3
x = -5/3
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