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x in (-oo:+oo)
5 > x/(-2) // - x/(-2)
5-(x/(-2)) > 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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