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x in (-oo:+oo)
(3*(x-1))/4 < 6 // - 6
(3*(x-1))/4-6 < 0
(3*(x-1))/4+(-6*4)/4 < 0
3*(x-1)-6*4 < 0
3*x-27 < 0
(3*x-27)/4 < 0
(3*x-27)/4 < 0 // * 4^2
4*(3*x-27) < 0
( 3*x-27 )
3*x-27 < 0 // + 27
3*x < 27 // : 3
x < 27/3
x < 9
( 4 )
4 < 0
x belongs to the empty set
(-oo:9) (9:+oo) 3*x-27 - + 4 + +
x in (-oo:9)
(-oo:9)
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