1.2^x=1500
    12.7%+x+12.7%x = -1.7%
    12.7%+x+12.7%+12.7%x=-1.7%
    24.2%+x+24.2%x=6.4%
    12.7%x+12.7%+x=1.7%
    5x^2-32x+52=6.25（x-5）^2
    5x^2-32x+52=4x^2-40x+100
    （x-4）^2+（2x-6）^2
    5x^2-32x+52=6.25（x^2-10x+25）
    20x^2-128x+208=25x^2-250x+625
    5x^2-32x+52=0
    -50-（100+x）*1%=10
    8*(1-x^3)/(1-X)＝47
    8*(1-x^3)/(1-X)＝40
    3x^6－4x^3+x^2+x－1＝0
    x*84%=1000
    8-(4*sqrt21-4)=(1-(1+sqrt21)/2)x
    sqrt(x^2+44)+sqrt(x^2+12)=16
    6^x-5^x=11
    sinx=（6.3cosx+25）/(6.3tanx+35)

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