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X in (-oo:+oo)
(3/7)*X-(4/5) = 2*X // - 2*X
(3/7)*X-(2*X)-(4/5) = 0
(3/7)*X-2*X-4/5 = 0
-11/7*X-4/5 = 0 // + 4/5
-11/7*X = 4/5 // : -11/7
X = 4/5/(-11/7)
X = -28/55
X = -28/55
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