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x in (-oo:+oo)
x/4 > 5 // - 5
x/4-5 > 0
1/4*x-5 > 0 // + 5
1/4*x > 5 // : 1/4
x > 5/1/4
x > 20
x in (20:+oo)
(20:+oo)
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