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x in (-oo:+oo)
x/4 > 68 // - 68
x/4-68 > 0
1/4*x-68 > 0 // + 68
1/4*x > 68 // : 1/4
x > 68/1/4
x > 272
x in (272:+oo)
(272:+oo)
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