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x in (-oo:+oo)
x-((5*x)/8) = 240 // - 240
x-((5*x)/8)-240 = 0
x+(-5/8)*x-240 = 0
3/8*x-240 = 0 // + 240
3/8*x = 240 // : 3/8
x = 240/3/8
x = 640
x = 640
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