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    20x*20÷20=720÷20
    0.2X÷0.2*0.2=5÷0.2
    0.2X*0.2÷0.2=5÷0.2
     (0.5-0.3)X=5
    5X=(0.5-0.3)
    X=5(0.5-0.3)
    X5=0.5-0.2
    3284949600=13.8×2100×(1181-x/2)x
    3284949600=13.8×2100×(1181-2/x)x
    e^x-(x-1)^2=0
    e^2-(x-1)^2=0
    8.25*x*x-15.5*x-121
    4000/x-6000/3x=1000
    4t×t-80t+400=225
    x+1/tan(x)=1.59
    x+1/tanx=1.5878729752720
    X^2-49x+180=0
    X^2-49x+180=2
    190t=180(t+3)
    [q*(q+1)*(q+2)][q*(q+1)(q+2)+1]=3660

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