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