(X-6970)/(760-6970)=(500-480)/(540-480)
    X-6970/7600-6970=500-480/540-480
    2x^3+35x^2+100x+112=0
    x²+1除以x
    2x^3+35x^2+100x+12=0
    x^2＝6×(120-x)
    x^2-110x+2200=0
    X+5=X×1.2
    1/x + lnx=1
    0.8*(1+X)/10+X = 10.8%
    sinx+2cosx=1
    84.1 = 33.023ln(x) - 5.6078
    50 = 33.023ln(x) - 5.6078
    X*X+3X=154
    84.1 = 33.82ln(x) - 6.2934
    50 = 33.82ln(x) - 6.2934
    2x^3+12x^2+18x=0
    x^3+x^2+9=0
    sqrt(x^2-12x+20)+sqrt(x^2+16)=6
    84.1 = 33.643ln(x) - 6.7799

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