x*0.88+225*0.12=250 x*0.88+230*0.12=252 x*0.88+242*0.12=205
    230*x+255*(1-x)=252
    log（x+5）+2
    x(5＋x)/[(1-x)(6＋x)]＝0.298÷1.01325
    x(5＋x)/[(1-x)(6＋x)]＝0.298
    ln(x/0.298)=31790×200/(8.314×473.15.673.15)
    x^2/[(0.1-x)*(1-3x)]=2140000000000000000
    x^2/(0.1-x)*(1-3x)=2140000000000000000
    x^2/(0.1-x)(1-3x)=2140000000000000000
    x∧2/(1-x∧2)=0.298÷2
    20x^0.2-x^1.2=2^1.2-2^0.2*x
    20x^0.2-x^1.2=2*2^0.2-2^0.2*x
    x＋0.05x＝147000
    20x^0.2-x^1.2=18*2^0.2-2^0.2x
    2^1.2-2^0.2*x+x^1.2=20x^0.2
    20x^0.2-x^1.2=18*2^0.2-2^0.2*x
    x（x+7）=450
    2.2974-1.1487x+x^1.2=20x^0.2
    2.2974-20x^0.2-1.1487x+x^1.2=0
    x^3+x^2-2x+3

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