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x in (-oo:+oo)
x/4-2 > 7*x // - 7*x
x/4-(7*x)-2 > 0
x/4-7*x-2 > 0
-27/4*x-2 > 0 // + 2
-27/4*x > 2 // : -27/4
x < 2/(-27/4)
x < -8/27
x in (-oo:-8/27)
(-oo:-8/27)
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