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x in (-oo:+oo)
x/3-(x/8) = 5/2 // - 5/2
x/3-(x/8)-(5/2) = 0
x/3-(x/8)-5/2 = 0
5/24*x-5/2 = 0 // + 5/2
5/24*x = 5/2 // : 5/24
x = 5/2/5/24
x = 12
x = 12
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