a2+700a+60000≥0
    (5-x)/2>1/3
    -x*x+4*x-3<=1
    -1/2＜-log（9，x）
    log((x+1),(x^2+x-6)^2)>4
    log((x+1),(x^2+x-6)^2)>=4
    lg(x+6)
    sqrt(log(2,x))<3-log(2,x)
    4^x>3^x
    12x^2-52x+55<=0
    12x-52x+55<=0
    5＞2a
    4＞2a-1
    3＞2x
    4＞2x-1
    4+2x＞4x-1
    3+2x+1＞4x-1
    3+2x＞4x
    3＞2x
    3+2x+1＞4x-1

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