y^3+3y-4=0
    x-100×1=2/5x
    1/8x+10=3/4x
    x-100=0.4x
    x+1=0
    6.25-(9.8×tan15)=x/(1-x×tan15)
    sin(x)-x*cos(x)=0
    20%x÷（x+10）=15%
    x7/3=4/3
    x7/3= 4/3
    x（30+x）=8800
    X^2-35X=250
    X2-35X=250
    2.625=x(1-cos(19800/3.14x))
    ((0.1a-2)/a+2)^2=3.24a
    ((0.1a-2)/a+2)=3.24a
    (0.1a-2)/a+2=1.6sqrta
    (x+6)×5/8=25
    4(x-5.6)=1.6
    a^2-220a+324=0

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