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x in (-oo:+oo)
(2/5)*x-4 = 8-((3/8)*x) // - 8-((3/8)*x)
(2/5)*x+(3/8)*x-8-4 = 0
31/40*x-12 = 0 // + 12
31/40*x = 12 // : 31/40
x = 12/31/40
x = 480/31
x = 480/31
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