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x in (-oo:+oo)
x = x/4+x/5+x/3+15 // - x/4+x/5+x/3+15
x-(x/4)-(x/5)-(x/3)-15 = 0
13/60*x-15 = 0 // + 15
13/60*x = 15 // : 13/60
x = 15/13/60
x = 900/13
x = 900/13
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