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X in (-oo:+oo)
(12/20)*X = 17/4 // - 17/4
(12/20)*X-(17/4) = 0
(12/20)*X-17/4 = 0
3/5*X-17/4 = 0 // + 17/4
3/5*X = 17/4 // : 3/5
X = 17/4/3/5
X = 85/12
X = 85/12
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