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x in (-oo:+oo)
x/25 > 21 // - 21
x/25-21 > 0
1/25*x-21 > 0 // + 21
1/25*x > 21 // : 1/25
x > 21/1/25
x > 525
x in (525:+oo)
(525:+oo)
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