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