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x in (-oo:+oo)
1/3-(x/5)+1/5 = x/3 // - x/3
1/3-(x/5)-(x/3)+1/5 = 0
8/15-8/15*x = 0 // - 8/15
-8/15*x = -8/15 // : -8/15
x = -8/15/(-8/15)
x = 1
x = 1
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