x^2+8x-960=0
    6x^(2)-3x^(2)=15
    3849.55+3.62x = 0.5*3.77*70x+（400+4*11.8*（x+1.95-3））*0.8*0.7*1.13
    6x-3x^(2)=15
    2x=4
    （x-1/11）×x＝152--x
    （80-4x)/2=12
    7.502382*x = 1-(1/1+x)^10
    1.026*x+(1-x)*7.6687=6.8472
    10000/1332.91
    0.12X^2-0.8X=4
    (1+5^0.5)/2=(4/3)^x
    (10000/1332.91)*x=1-(1/1+x)^10
    8.4=10.2a-113/a
    7*X^2+15*X+7=0
    sinx=0.69
    3x＾2-3x=15
    3849.55+3.62x=0.5*3.77*70x+（400+4*11.8*（x+1.95-3））*0.8*0.7*2.27
    0.04*10000 = x*[(1.04)^(10)-1]
    0.04*10000=x*[(1.04)^10-1]

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