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a in (-oo:+oo)
3*a+5 = 31/11 // - 31/11
3*a-(31/11)+5 = 0
3*a-31/11+5 = 0
3*a+24/11 = 0 // - 24/11
3*a = -24/11 // : 3
a = -24/11/3
a = -8/11
a = -8/11
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