x+X*0.06=13100
    x2=4
    10.34x^3+120.82x^2-1180.26=0
    8.99x^3+71.23x^2-377.85=0
    ln(x+4)+3*x
    sin(x^2)-4*x
    e^x-3*x
    3x=0.5(x-4x)+1
    40/a-10/2a=10
    -(a-2)/(a+2)*((a+2)^2)/(a+1)
    -3a/(-2)-2/(-2)=2
    x/(x+1)+2/(x-1)=1
    x/(x-3)-1/(x+3)=1
    1/d+1/（d+2）+1/（d+3） = 0
    1/d+1/（d+2）+1/（d+3）＝1/（d+5）
    2800/x-1600/(x/3.5)=4
    450/x=480/(1.2x)+1
    450/x=480/1.2x+1
    arctanx^3
    600n-2280=0

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