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x in (-oo:+oo)
x-8 = (3/8)*x // - (3/8)*x
x-((3/8)*x)-8 = 0
x+(-3/8)*x-8 = 0
5/8*x-8 = 0 // + 8
5/8*x = 8 // : 5/8
x = 8/5/8
x = 64/5
x = 64/5
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