54x62-53x63
    x*lnx=0.0075
    sinx/x
    22x+x^2=112
    sin2a+cos2a=-7/17
    sin2a+cos2a=-7/17
    89400+1634*X＝13230*X
    8785+153*X＝751*X
    ln(x)＝3.9254974548819
    0.073=6843x^4-192x^3+37.07x^2+0.8234x
    1/sqrt(1+x^2)
    (X／5)+(51-x)/12=(51-x)／4+(x/12)
    X/5+51-x/12=51-x/4+X/12
    18×10×x＝1728
    18x10xx=1728
    18x10xx
    （114661-2.5X）*12.8/23.8*0.9=24346+11X
    x÷(x＋117)＝8÷17
    x÷(x＋117)＝8÷17
    x*0.12=1604

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