X+3=9
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=5600
    13.14c=（3.3+c）×6.92
    1572.05+27.14x=160.65+1.785*(20x-50)/x*(x-3)
    134.59h+302.55/h-321.2=0
    7912/5250=8808/x
    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

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