（26.274+x）×0.85＝52.549+69.623-x
    （26.274+x）×0.85＝52.549+70.623-x
    （26.274+x）×0.85＝52.549+71.623-x
    （26.274+x）×0.85＝52.549+72.623-x
    （26.813+x）×0.85＝53.627+74.24-x
    12.13×c=（3.3+c）×8.96
    12.13×c=（3.3+c）×8.97
    x*（X-1）=210
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*215/x*0.35805183739485175)^0.05)=7.611/x
    x-（2/3+1/4）=1/12
    1+x-3/8=9/10
    x+2/7=2/3
    (2d+5)(d+7)(d+1)(d+2)(d+3)8=0
    94(1+x)^140=108
    5000*a=4750
    （X-X/1.13*0.13+0.00615）/7.199=0.074814
    9x^3+x^2-x-1
    (1/s)+(1/s+5)+(1/s+2)
    （8-x）2-x2=4
    x-（x-6）

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