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x in (-oo:+oo)
6-(x/2) > 7 // - 7
6-(x/2)-7 > 0
-1/2*x-1 > 0 // + 1
-1/2*x > 1 // : -1/2
x < 1/(-1/2)
x < -2
x in (-oo:-2)
(-oo:-2)
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