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x in (-oo:+oo)
3*x-(x/8) = 3 // - 3
3*x-(x/8)-3 = 0
23/8*x-3 = 0 // + 3
23/8*x = 3 // : 23/8
x = 3/23/8
x = 24/23
x = 24/23
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