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x in (-oo:+oo)
(3*x)/(-8) = -8 // + 8
(3*x)/(-8)+8 = 0
8-3/8*x = 0 // - 8
-3/8*x = -8 // : -3/8
x = -8/(-3/8)
x = 64/3
x = 64/3
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