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x in (-oo:+oo)
7*x-(5/3) < -131/3 // + -131/3
7*x-(5/3)-(-131/3) < 0
7*x-5/3+131/3 < 0
7*x+42 < 0 // - 42
7*x < -42 // : 7
x < -42/7
x < -6
x in (-oo:-6)
(-oo:-6)
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