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x in (-oo:+oo)
(-1/4)*x > -4 // + 4
(-1/4)*x+4 > 0
4-1/4*x > 0 // - 4
-1/4*x > -4 // : -1/4
x < -4/(-1/4)
x < 16
x in (-oo:16)
(-oo:16)
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