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