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x in (-oo:+oo)
(2/3)*(2*x-1) < -6 // + 6
(2/3)*(2*x-1)+6 < 0
2/3*(2*x-1)+6 < 0
2/3*(2*x-1)+6 < 0
4/3*x+16/3 < 0
4/3*x+16/3 < 0
4/3*x+16/3 < 0 // - 16/3
4/3*x < -16/3 // : 4/3
x < -16/3/4/3
x < -4
(-oo:-4) (-4:+oo) 4/3*x+16/3 - +
x in (-oo:-4)
(-oo:-4)
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