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x in (-oo:+oo)
x/3+1 = x/5+3 // - x/5+3
x/3-(x/5)-3+1 = 0
2/15*x-2 = 0 // + 2
2/15*x = 2 // : 2/15
x = 2/2/15
x = 15
x = 15
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