7p/10+8/5=19/4
     3*8x/6=12
    ??3*8x??/6=12
    (1.5+e)27%=6.36
    ??3*8x??/6=12
    12(l+5)=132
    x-sinx=3.3587
    x*x+1.19x-1.19=0
    x^2-400x+35000=0
    x^2-600x+35000=0
    300x=255
    x^2+400x-65000=0
    xx+9.12x-80=10
    ??ը
    2x^3+3x-1=0
    x/((1-x)^2)=(0.8-x)/0.04
    x-（20%x+20%*125%）=88
    y^2 * 2^y + 4^y^y - 2^(3*y)= 33-y
    x^3-74x^2+1617x-8649=0
    ln2a＝2a－1

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