x/(1+200/100)-x/(1+230/100)=300
    x/(1+x/100)-x/(1+x*1.15/100)=300
    1000(1+m/2%)×500(1+m%)=660000
    1000(1+m/2)×500(1+m)=660000
    1000(1+m/2)×500(1+m)=660000
    x^2+4x
    9x²-72x+112=0
    （x—30）*（1—30%）/400=（x—40）*（1—20%）/200
    （800+X-12168.93）*(1-25%)+5213.15=5634.18
    x-4/x=90
    x^3+3x+6=0
    (x-40-200*10%)*(1-20%)/(600+200)=(x-40-300*15%)*(1-20%)/(600+100)
    (X-40-200x10%)x(1-20%)-(600+200)=(X-40-300x15%)x(1-20%):(600+100)
    1.01845-4.05*0.00001*(x-293.15)-9.5*0.0000001*(x-293.15)^2=-1.135*0.0001*x
    12000X-4000X=16000
    2X*6000-4000X=16000
    1/2-(x-3)/3=1
    1/2-x-3/3=1
    1/2-x-3/3=1
    1/2-x-3/3=1

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