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x in (-oo:+oo)
x/3+x/5 = 16/8 // - 16/8
x/3+x/5-(16/8) = 0
x/3+x/5-2 = 0
8/15*x-2 = 0 // + 2
8/15*x = 2 // : 8/15
x = 2/8/15
x = 15/4
x = 15/4
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