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    xxx-2x-2=0
    n/sinn=57.41037
    n/sinn=57.4
    n/sinn=114
    10000/90*(x+17.921)+(150-10000/90)*x=20000
    (149+217)/31*x+279/31*(x+15)+124/31(x+30)=1549
    (X+300):(3X-300)=1:2
    100-(x/5.44)*100=0.399
    x^2+x-2=0
    (2.77+x)/x=21
    (20-x)(300+20x)=3000
    (x+1)^10+(x+1)^9+(x+1)^8=3.8290
    (2.77+x)/x=18
    1.0×14.3×250×125=360×X
    180×10^6=1.0×14.3×250×x(465-1/2×x)
    -2x∧3-2x+1=0
    0=-200+110/(1+a)+121/(1+a)^2
    150*27.5x/(x+0.126)*150*(1-0.00205/3x)=360*157+200*157*(1.449-35x)/150-200*157*0.0018+240000*0.0126*50*0.167*3
    x%*15%+(70%-x%)*20%+30%*10%=13%
    x%*15%+(70%-x%)*20%+30%*10%=13%

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