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x in (-oo:+oo)
(7/13)*x-1 > 1/2 // - 1/2
(7/13)*x-(1/2)-1 > 0
(7/13)*x-1/2-1 > 0
7/13*x-3/2 > 0 // + 3/2
7/13*x > 3/2 // : 7/13
x > 3/2/7/13
x > 39/14
x in (39/14:+oo)
(39/14:+oo)
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