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x in (-oo:+oo)
x/(-2)-8 < -2 // + 2
x/(-2)-8+2 < 0
-1/2*x-6 < 0 // + 6
-1/2*x < 6 // : -1/2
x > 6/(-1/2)
x > -12
x in (-12:+oo)
(-12:+oo)
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