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x in (-oo:+oo)
(1/4)*x-25 > 75 // - 75
(1/4)*x-75-25 > 0
1/4*x-100 > 0 // + 100
1/4*x > 100 // : 1/4
x > 100/1/4
x > 400
x in (400:+oo)
(400:+oo)
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