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