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    60-10t+4t=2*10t
    x²+4x+4
    a/sin(a)=4.63/4.08
    x^2-2x+1=0
    abs(x+13)+(x+13)^2=0
    abs(x+13)+sqrt(x+13)=0
    50x+15=(50+5)×(x-1)
    50x+15=(50+5)×(x-1)
    8x ^2+32x =26
    x*x/(1-x)=1.49
    36 c^2+21 c-23=0
    x=754÷(3-200)
    x=754÷(x-200)
    (59-x)/59=45%
    (59-x)/59=50%
    x²(1-754÷x²)=200
    x²=200+754
    20lg(20x)-20lg(x)-40lg(x/2)=-20lg4
    20lg(20x)-20lg(x)-40lg(x/2)=20lg4
    arctan(20x)-arctan((0.1x)/(4-xx))=-π/2

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