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x in (-oo:+oo)
3*x-(2/(-5)) < 6 // - 6
3*x-(2/(-5))-6 < 0
3*x+2/5-6 < 0
3*x-28/5 < 0 // + 28/5
3*x < 28/5 // : 3
x < 28/5/3
x < 28/15
x in (-oo:28/15)
(-oo:28/15)
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