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a in (-oo:+oo)
3*a-9+5 = 21/21 // - 21/21
3*a-(21/21)-9+5 = 0
3*a-9-1+5 = 0
3*a-5 = 0 // + 5
3*a = 5 // : 3
a = 5/3
a = 5/3
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