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a in (-oo:+oo)
(-1/2)*a > 10 // - 10
(-1/2)*a-10 > 0
-1/2*a-10 > 0 // + 10
-1/2*a > 10 // : -1/2
a < 10/(-1/2)
a < -20
a in (-oo:-20)
(-oo:-20)
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