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x in (-oo:+oo)
(x/(-1))/6 = 5/7 // - 5/7
(x/(-1))/6-(5/7) = 0
-x/6-5/7 = 0
-1/6*x-5/7 = 0 // + 5/7
-1/6*x = 5/7 // : -1/6
x = 5/7/(-1/6)
x = -30/7
x = -30/7
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