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x in (-oo:+oo)
x/3 > 7 // - 7
x/3-7 > 0
1/3*x-7 > 0 // + 7
1/3*x > 7 // : 1/3
x > 7/1/3
x > 21
x in (21:+oo)
(21:+oo)
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