(103+X)/2=99
    5=22.5÷x
    e*2x=1
    2000/x=10000/x+8
    X ／2000 =x+8/10000
    x^2+5x+3=0
    x^2+5x+3=0
    x^2+3x-3=0
    x^2+4x-3=0
    250.53+X-(250.53+X)*0.0036=3438.11
    483.62+X-(483.62+X)*0.0036=2524.5
    ((6*x-3*(9-x)*(2-sqrt(9-x)))/x)^2+9=((-18*sqrt(9-x)+81-3*x)/x)^2
    88.22 = 0.6875*[1-(1+x)^-41]/x+100/(1+x)^41
    0.88x=500×0.9+0.88x-440
    0.88x=500×0.9+0.88（x-500）
    88.22 = 0.6875/(1+x)^-41+100/(1+x)^41
    0.88x=500×0.9+0.88x-440
    116.3 = 0.6875*[1-(1+x)^41]/x+100/(1+x)^41
    x²－300x+14400＝0
    1300+X-(1300+X)*0.0036=2524.5

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