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x in (-oo:+oo)
10 < 6-((1/2)*x) // - 6-((1/2)*x)
(1/2)*x-6+10 < 0
1/2*x+4 < 0 // - 4
1/2*x < -4 // : 1/2
x < -4/1/2
x < -8
x in (-oo:-8)
(-oo:-8)
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