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x in (-oo:+oo)
5-(x/4) > 6 // - 6
5-(x/4)-6 > 0
-1/4*x-1 > 0 // + 1
-1/4*x > 1 // : -1/4
x < 1/(-1/4)
x < -4
x in (-oo:-4)
(-oo:-4)
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