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x in (-oo:+oo)
(1/2)*x-1 > 17 // - 17
(1/2)*x-17-1 > 0
1/2*x-18 > 0 // + 18
1/2*x > 18 // : 1/2
x > 18/1/2
x > 36
x in (36:+oo)
(36:+oo)
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