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x in (-oo:+oo)
x/2+x/5+x/3 = 31 // - 31
x/2+x/5+x/3-31 = 0
31/30*x-31 = 0 // + 31
31/30*x = 31 // : 31/30
x = 31/31/30
x = 30
x = 30
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