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    2/7+x-4/9=2/3
    1/d+1/(d+0.04 )+1/(d+1 )+1/(d+5)= 0
    2arctan2x+arctanx=180
    cosx=0.478
    x*27^x=1
    2*5.12*1000000*(345-8500000/x)=1.15*345*5.21*1000000*2
    2*5.12*10^6*(345-8500000/x)=1.15*345*5.21*10^6*2
    (2x-3)/5=2/3x-2
    2.4-(x-4)/2=3/5x
    y^4
    X^4+4X^3+6X^2+4X+1=0
    2xx+3x=3
    x(65-x)=1065
    x=tanx
    x^2=-1
    2^x=-1
    37.5%x+4=4/9(x+4)
    x+x*10=99
    (X-17%)/(18%-17%)=(0-230)/(-78-230)
    10=100×(300-X)/(300×200/100)

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