5x-1<3(x+1) (2x-1)/3-(5x+1)/2<=1
    x-1>-2(x-1) (1-x)/2+10>=(x+2)/3
    3x+3>=2x+7 (2x+4)/3<3-x
    x/6+1>(x+2)/3
    x+(3x-1)<=2x-7
    xx-6x+8<0
    xx+6x-8>0
    （x-1）（5x-1）＞0
    abs（x^2+2x-3）＞1
    -x^2-2absx+3＜0
    （3x^2-3x+6-x^3+x^2-2x）÷（-x^2+10x-21）≥0
    （3x^2-3x+6-x^3+x^2-2x）÷（-x^2+10x-21）≥0
    （3x^2-3x+6-x^3+x^2-2）÷（-x^2+10x-21）≥0
    （4x^2+x^3+5x-6）÷（x^2-10x+21）≥0
    （4x^2+x^3+5x-6）÷（x^2-10x+21）≥0
    （4x^2+x^3+5x-6）÷x^2-10x+21≥0
    x（x+1）≥3（x+1）^2
    2x^2+6√2+9＜0
    -x^2+7x-6＞0
    （2x+1）（x-3）＞3（x^2+2）

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