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x in (-oo:+oo)
3*x < -5/5 // + -5/5
3*x-(-5/5) < 0
3*x+1 < 0
3*x+1 < 0 // - 1
3*x < -1 // : 3
x < -1/3
x in (-oo:-1/3)
(-oo:-1/3)
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