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    t^2+26t=0
    t^2-26t=0
    2ln(1+x)=12
    75%x+0.45x=0.6
    2n+2n+2n+2n+2n=32
    A×A+A=240
    83.2+(21-x)*4.3=(50+6.5x)/1.5
    126.4+(26-x)*4.3=(50+6.5x)/1.5
    1n+n乘n
    ((x^3)^-2)=1000
    √x=lnx
    ((x^3)^-2)=1000
    1/(1+x^2)=x^2-1/3
    (sqrt((6+x)*(6+x)+9*x*x)/2)*(sqrt((6+x)*(6+x)+9*x*x)/2)=x*x+36
    172X²-10X=66
    ((x^3)^-2)=1000
    x²-2023x-2024=0
    x×x-x=10
    1946-7(190-4x)=956-2(3x-17)
    x²-100x=-2100

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