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x in (-oo:+oo)
(-1/4)*x > 3 // - 3
(-1/4)*x-3 > 0
-1/4*x-3 > 0 // + 3
-1/4*x > 3 // : -1/4
x < 3/(-1/4)
x < -12
x in (-oo:-12)
(-oo:-12)
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