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x in (-oo:+oo)
-6*x > 1/13 // - 1/13
-6*x-(1/13) > 0
-6*x-1/13 > 0
-6*x-1/13 > 0 // + 1/13
-6*x > 1/13 // : -6
x < 1/13/(-6)
x < -1/78
x in (-oo:-1/78)
(-oo:-1/78)
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