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x in (-oo:+oo)
x/10 > 2 // - 2
x/10-2 > 0
1/10*x-2 > 0 // + 2
1/10*x > 2 // : 1/10
x > 2/1/10
x > 20
x in (20:+oo)
(20:+oo)
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