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x in (-oo:+oo)
x/5-2 > 1 // - 1
x/5-2-1 > 0
1/5*x-3 > 0 // + 3
1/5*x > 3 // : 1/5
x > 3/1/5
x > 15
x in (15:+oo)
(15:+oo)
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