1<2x-3
    2x<3 1+x<2x
    x-3<=0 x/2>1
    600+2x-33x<0
    (x^2+5x+4)/(x-3)>=-2x
    (2x^2+3x+1)/(2-x)<0
    4(x-0.3)<0.5x+5.8 3+x>0.5x+1
    4(x-0.3)<=0.5x+5.8
    400+0.6(x-400)<0.8x
    (x-2)/(3x-2)＞1
    2x∧2-9x+4＜0
    2x∧3-3x∧2-8x＋12≥0
    0.9x>100+0.8(x-100)
    0.9x<100+0.8(x-100)
    6x/(x*x+1)＞2x-1
    2x+5＜4x-1
    2x+5＞4x-1
    2x+5＞4x-1
    x-1/x-2>1
    7(x+100)-6x>=240×7×0.6

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