x^2=2^x 2x^x=x2^x x^2=x*2^x 2*x^2=x*2^2 x2^2=2x^2
    x^2=2^x
    x^2+24x+12=0
    2√3/5=[(√3-3)/(√3-2x)]{(-8√3x)/[4(x^2)+3]+(√3/x)}
    -2/3xx+2x=2
    1.5x*8+1.2x*2-10x=1.5x*10-10x-390
    (20+2x)(40-x)=1300
    (20+2x)(40-x)=1200
    3k^3+30k^2+63k-108=0
    x^3+12x+9=0
    73.8×7+76.6×X=74×（7+X）
    20lgx
    4x2-35x-69=0
    14x+20=15x—11
    1/d+1/（d+2）=1/（d+3）
    xx+36 = （8-x）（8-x）+20
    x-1＝0
    xx+36=（8-x）（8-x）-16
    8*8-25-10x-x*x=25-x*x
    0.081=6843X4-192X3+37.07X2+0.8234X

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