5y/2=50
    70y/2=70
    5x/2=50
    5x/2=50
    x*0.40=x*0.45-181920
    5x/2=50
    x*0.44=x*0.45-181920
    x*0.40=x*0.45-181920
    x*0.45=x*0.45-181920
    x*0.63*2.77*1.01*1.81=1.41
    0/x=x
    6%*b+20%*(1-b)=13%
    8(x-1)^3+12x(x-1)^2=0
    5.30% = ((100000-P)/100000)×(360/182)
    e^sinx+e^(-sinx)
    40×x²÷(7.2-2.16x)=√(19.6x+40²÷12²×x²)
    -7.81642x^3+8.314764x^2-5.37781x+0.767221=0
    -12.3037799x^3+12.32746544x^2-6.44856658x+1.03902886=0
    8n^4-20n^2-1575=0
    32400=(-1.131*(ln(85860/x))^3+13.635*(ln(85860/x))^2-30.594*(ln(85860/x))+29.267)*x

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