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X in (-oo:+oo)
(5*(-X-1))/7 = 6*X // - 6*X
(5*(-X-1))/7-(6*X) = 0
(5*(-X-1))/7-6*X = 0
(5*(-X-1))/7+(-6*7*X)/7 = 0
5*(-X-1)-6*7*X = 0
-47*X-5 = 0
(-47*X-5)/7 = 0
(-47*X-5)/7 = 0 // * 7
-47*X-5 = 0
-47*X-5 = 0 // + 5
-47*X = 5 // : -47
X = 5/(-47)
X = -5/47
X = -5/47
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