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a in (-oo:+oo)
(3/11)*a = 15/20 // - 15/20
(3/11)*a-(15/20) = 0
(3/11)*a-3/4 = 0
3/11*a-3/4 = 0 // + 3/4
3/11*a = 3/4 // : 3/11
a = 3/4/3/11
a = 11/4
a = 11/4
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