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x in (-oo:+oo)
(-1/2)*x < 5 // - 5
(-1/2)*x-5 < 0
-1/2*x-5 < 0 // + 5
-1/2*x < 5 // : -1/2
x > 5/(-1/2)
x > -10
x in (-10:+oo)
(-10:+oo)
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