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x in (-oo:+oo)
x/5-9 > 3 // - 3
x/5-9-3 > 0
1/5*x-12 > 0 // + 12
1/5*x > 12 // : 1/5
x > 12/1/5
x > 60
x in (60:+oo)
(60:+oo)
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