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X in (-oo:+oo)
(3*X)/7 = 1-X // - 1-X
(3*X)/7+X-1 = 0
10/7*X-1 = 0 // + 1
10/7*X = 1 // : 10/7
X = 1/10/7
X = 7/10
X = 7/10
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