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a in (-oo:+oo)
a/4.1 < -16 // + 16
a/4.1+16 < 0
0.24390244*a+16 < 0 // - 16
0.24390244*a < -16 // : 0.24390244
a < -16/0.24390244
a < -65.59999974
a in (-oo:-65.59999974)
(-oo:-65.59999974)
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