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x in (-oo:+oo)
x/5+x/3 = 10 // - 10
x/5+x/3-10 = 0
8/15*x-10 = 0 // + 10
8/15*x = 10 // : 8/15
x = 10/8/15
x = 75/4
x = 75/4
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