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x in (-oo:+oo)
(1/4)*x > 15 // - 15
(1/4)*x-15 > 0
1/4*x-15 > 0 // + 15
1/4*x > 15 // : 1/4
x > 15/1/4
x > 60
x in (60:+oo)
(60:+oo)
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