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    x^3-2x+4
    x^2-4x+3
    10t^2-28t+25=0
    (x+20)²+x²-(26√2)²=0
    -x²+540x-32000
    2*x(1-x^2)=x
    x×x=15.37(1-2x)(1-2x)
    x×x=15.37(0.1-2x)(0.1-2x)
    x×x=15.37(0.1-2x)(0.1-2x)
    c×c=15.37(0.1-2c)(0.1-2c)
    13+(2x-27)6=151
    3*x^2+2*x=-8
    4x/(x^2-4)+2/(2-x)=1+1/(x+2)
    8x^2 +17x +8=0
    284/31*x+170.5/31*(x+15)+86.5/31(x+30)=1277
    x^5=x^x
    (1.56166e-10)*x^5 - (1.267e-8)*x^4 + (7.04565e-6)*x^3 + 0.0227*x^2-500
    (1.56166*e-10)*x^5 - (1.267*e-8)*x^4 + (7.04565*e-6)*x^3 + 0.0227*x^2-500
    x^4-(x-0.02)^4=0.6094848
    46x²+92x-80=0

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