tanx+x=0
    2*（x^3）+21*（x^2）+60*x+40 = 0
    2*x*x*x+21*x*x+60*x+40=0
    x^2-28x+180=0
    3x-5=(x-5)×5
    2y-1/4=1-(3-y/8)
    k^2+6k+9=0
    7/5y-4/5y=-4+9
    1/k²-3+2（k+1）=7
    6k²-4k-10=0
    k^2+8k+7=0
    20000I²-600I+9=0
    x+x*6%=103882.82
    8x^2-300x-1400=0
    X+X*6%=229236.46
    x^4-4x^2-2x-1=0
    X+0.01X*47=470
    X+1.01X*47=470
    1.5x*8+1.2x*2-10x=1.5x*10-10x-390
    arctan-2=x

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