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x in (-oo:+oo)
x = 3-((1/8)*x) // - 3-((1/8)*x)
x+(1/8)*x-3 = 0
9/8*x-3 = 0 // + 3
9/8*x = 3 // : 9/8
x = 3/9/8
x = 8/3
x = 8/3
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