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x in (-oo:+oo)
x/10 > 3 // - 3
x/10-3 > 0
1/10*x-3 > 0 // + 3
1/10*x > 3 // : 1/10
x > 3/1/10
x > 30
x in (30:+oo)
(30:+oo)
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