3(x-3)<7x-3
    2x-1>4x-4
    2(x-1)+3<3x
    x/2>(x+1)/3
    x/2-1<7-3x/2
    (x-2)/3+4>x
    x-2/3+4>x
    2（x+1）+3<3x x-2/3+4>x
    13+x>1/3(45+x)
    1/3*x+25<=22
    2x+0.25<6+0.25
    13-5x>-7x+9
    4-6x<-x-1
    -9x<-3x-24
    8-x>-3x
    12-2x>3x-8
    23-x<5x+5
    21-2x<7
    6-7x<20
    2x^-5x-3<0

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