81.9207/X=1.05
    x*ln（x/9.054)=0.7153524395683
    -x^（-2）
    x*ln(x/9.054)=0.089
    （7140-x）➗8＝x➕450
    10÷x÷sqrt(1+0.25×x×x)÷sqrt(1+0.0004×x×x)=1
    x*ln(x/9.054)=0.69354
    1-（1+X）∧-50＝13.7931X
    x^3-x
    x*ln(x/9.016)=0.69354
    x*ln(x/9.016)=0.60060
    (2∧16-x)×10∧－6＝1
    (3*x-48)/(2*x+48)=2:3
    0.51=x/√(1-x∧2)
    x^3/e^x
    x-48=(x-90)*3
    2x²+9x-42=0
    x∧2＝-1
    （8-x)(200+50x)=1750
    x+x*10% = 1000

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