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a in (-oo:+oo)
(3/11)*a-1 = 7/11+9 // - 7/11+9
(3/11)*a-(7/11)-9-1 = 0
(3/11)*a-7/11-9-1 = 0
3/11*a-117/11 = 0 // + 117/11
3/11*a = 117/11 // : 3/11
a = 117/11/3/11
a = 39
a = 39
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