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x in (-oo:+oo)
-x/3 = 3*x-8 // - 3*x-8
8-x/3-(3*x) = 0
8-x/3-3*x = 0
8-10/3*x = 0 // - 8
-10/3*x = -8 // : -10/3
x = -8/(-10/3)
x = 12/5
x = 12/5
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