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a in (-oo:+oo)
3*a = 6/11 // - 6/11
3*a-(6/11) = 0
3*a-6/11 = 0
3*a-6/11 = 0 // + 6/11
3*a = 6/11 // : 3
a = 6/11/3
a = 2/11
a = 2/11
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