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x in (-oo:+oo)
x-(x/5)-(x/4)-(x/3) = 520 // - 520
x-(x/5)-(x/4)-(x/3)-520 = 0
13/60*x-520 = 0 // + 520
13/60*x = 520 // : 13/60
x = 520/13/60
x = 2400
x = 2400
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