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    0.0004x^6 + 0.05x^4 + x^2 - 900 = 0
    0=Q×7.15-(Q×2.87+2858.73)-Q×0.08
    (2x-6)(8-2x) = 3÷4
    (2x-6)(8-2x)=¾
    (2x-6)(8-2x)
    1/2x=-2x²+x+2
    x/(1400+x)*100%=25%
    x/(1960+x)*100%=25%
    (64/(2^(2*x-1)))-8=1-2^x-(64/(2^(2*x-1)))
    (6-2k)/3=2(-5/9+3)
    320/4000-50/4000-[(1+X)/X]×2.5%×40%=0
    [2x/(x-2)]+1=5/(2-x)
    [2x/(x-2)]+1=5/(2-x)
    [2x/(x-2)]+1=5/(2-x)
    X-23/2十X-19/4十X-15/6十X-11/8十X-7/10=10
    50X^2-135X+64=0
    (X-32)/(lnX-ln32)=38.5
    (X-32)/(lnX-ln32)
    5(x²-x)=3(x²+x)
    2/3t²-2t=1

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