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    861310000=18.4*1400*x*(1145-2/x)
    x=cosx
    x=tanx
    2204040000=18.4*1400*x*(1145-2/x)
    b^2-4b-35/9=0
    3*(5X+1)-48=0
    80/(80+x)=0.8
    a+2=3
    0.260x-0.151X=0
    2700*(1+X)^3=2715
    (-2)^n
    x^3+1=0
    28×7.3+11.99c=(28+c)×7.97
    28×7.3+11.99c=(28+c)×7.98
    (150+296.5)/30*x+185/30*(x+15)+120/30(x+30)=1476
    (135+281.5)/30*x+208/30*(x+15)+90/30(x+30)=1436
    (72+281.5)/30*x+208/30*(x+15)+90/30(x+30)=1436
    13-67x=88x
    (x-2)^2+4*x-20=0
    145*10^7=13.8*200*x*(460-0.5x)

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