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    25-0.25p=0.5p-20
    25-1/4p=1/2p-20
    -1/4p-1/2p
    25-0.25p=0.5p-20
    20-p=2p-10
    14-p=-4+2p
    (27118-a)/a=0.46
    5x-24=x+24
    2x^3+x^2=4x
    5x^2=√5+5
    0.99^n=0.3
     a²+1 = -2
    a2+1=-2
    6x+6[x/(1+5x)]=1
    6(x+x/1+5x)=1
    (X-60)[20十2(100-x)]=1200
    (5/16)*(x+4)=(1/4)x+4
    (x-40)/x=0.618
    x²+x=1
    x*x-x=240

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