6x-4＞2x
    x-5＞2x
    4x+2≤10
    6x＜3
    3x＞12
    3x＞12
    （x+1）（x-2）≤0
    2.4x-3x+20.4=3+2x
    39=46.23757+(36.95662-46.23757)/(1+(x/11.34121)^1.24206)
    4X^3-18X^2+22X-6=0
    4x=36
    t(t+1)(t+2)(t+3)+1
    39=44.99342+(36.95974-44.99342)/(1+(x/11.38671)^1.26872)
    43=44.99342+(36.95974-44.99342)/(1+(x/11.38671)^1.26872)
    43=43.26274+(36.97297-43.26274)/(1+(x/11.91313)^1.2798)
    2-512/x^2
    39=43.26274+(36.97297-43.26274)/(1+(x/11.91313)^1.2798)
    x×x＋85x－2100＝0
    1+1024/x^2=0
    x^4+2x+5=0

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