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x in (-oo:+oo)
x/18 > 7 // - 7
x/18-7 > 0
1/18*x-7 > 0 // + 7
1/18*x > 7 // : 1/18
x > 7/1/18
x > 126
x in (126:+oo)
(126:+oo)
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