x-1/7<2x+5/3
    (x+3)/5>2x+3 (x+3)/5>1-x
    -3(x-2)>=4-x (1+2x)/3>x-1
    -3/k＞2
    -3/k＞-2
    3X-2≥x
    x-4<4X+2
    R*5.1*（4.7+100）/（R+5.1）<1/(2*π*100)
    -(7*k+2)-sqrt((2+7*k)^2-4+28*k)<0
    -(7*k+2)+sqrt((2+7*k)^2-4+28*k)<0
    -(5*k+6)+sqrt((6+5*k)^2-36+20k)<0
    -(5*k+6)-sqrt((6+5*k)^2-36+20k)<0
    4(3x-4)<=38
    x-(3x/4+x/7)>6
    x-(3x/4+x/7)<6
    264<=8x
    3x+2<25
    3x+4<25
    (52+x+69+90)/4>90
    12+x>37/2

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