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x in (-oo:+oo)
x/16 < -3 // + 3
x/16+3 < 0
1/16*x+3 < 0 // - 3
1/16*x < -3 // : 1/16
x < -3/1/16
x < -48
x in (-oo:-48)
(-oo:-48)
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