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x in (-oo:+oo)
(1/4)*x > 13/2 // - 13/2
(1/4)*x-(13/2) > 0
(1/4)*x-13/2 > 0
1/4*x-13/2 > 0 // + 13/2
1/4*x > 13/2 // : 1/4
x > 13/2/1/4
x > 26
x in (26:+oo)
(26:+oo)
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