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x in (-oo:+oo)
(2/3)*x-3 < 2/3-7 // - 2/3-7
(2/3)*x-(2/3)-3+7 < 0
(2/3)*x-2/3-3+7 < 0
2/3*x+10/3 < 0 // - 10/3
2/3*x < -10/3 // : 2/3
x < -10/3/2/3
x < -5
x in (-oo:-5)
(-oo:-5)
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