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x in (-oo:+oo)
x/4 < -64 // + 64
x/4+64 < 0
1/4*x+64 < 0 // - 64
1/4*x < -64 // : 1/4
x < -64/1/4
x < -256
x in (-oo:-256)
(-oo:-256)
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