Mathematics
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    x^3-x^2+1/4=0
    (y+1)/(y+2)+(y+8)/(y+9)=(y+2)/(y+3)+(y+7)/(y+8)
    (x+1)(x+2)=(x+3)(x+4)
    0.|1x=1/x
    x+1/2(x-1)+1/4(x-2)=1/8(x-3)+1/16(x-4)+1/32(x-5)
    2/3(x-2)+5/7(2x-3)=10/21(x-2)-17/21(2x-3)
    X^3-2X^2=144
    1/3(3/5(5/7(7/9(1+a)+a)+a)+a)+a=1/3(3/5(5/7(7/9(1-a)-a)-a)-a)-a-100/9%
    x+1=x+1
    2x^2+2x+2=3x^2+5x+1
    1/2(2/5(5/9(9/8(1-x)-1-x)-1-x)-1-x)-1-x=1/3(3/4(4/6(6/10(1-x)-x)-x)-x)-x
    1/2x(1/3(1/4(1+x)+x)+x)+1=0
    1/2(1/3(1/4(1/5(x+1)+1)+1)+1)+1=0
    x^3+4x^2(x+1)+10x(x+1)^2+7(1+x)^3=0
    x^2+x+1=0
    2.4*(1+a%)*10*400+10*500*(1+2a%)*2.4*(1+a%)=21600*(1+20/9*a%)
    85=0.5×(5/34)t^2
    2.4*(1+a%)*400+500*(1+2a%)*2.4*(1+a%)=21600*(1+20/9*a%)
    2.4*(1+a%)*400+500*(1+2a%)*2.4*(1+a%)=21600*(1+9/20*a%)
    2.4*(1+a%)*400+500*(1+a%)*2.4*(1+a%)=21600*(1+9/20*a%)

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