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x in (-oo:+oo)
(3*x)/(-1) = 8 // - 8
(3*x)/(-1)-8 = 0
-3*x-8 = 0
-3*x-8 = 0 // + 8
-3*x = 8 // : -3
x = 8/(-3)
x = -8/3
x = -8/3
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