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x in (-oo:+oo)
3*x-(12/12) < (2*x)/3 // - (2*x)/3
3*x-((2*x)/3)-(12/12) < 0
3*x+(-2/3)*x-1 < 0
7/3*x-1 < 0 // + 1
7/3*x < 1 // : 7/3
x < 1/7/3
x < 3/7
x in (-oo:3/7)
(-oo:3/7)
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