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    x/3=3
    x*0.8+(10000-x)*0.21=10000*0.4
    x*0.8+(10000-x)*0.21=10000*0.35
    5000000乘297=3000000x
    (30+80-X)=1.5×(40+X)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.455917)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.3735549)
    (x*92%)+(x*92%*6%)=1306391.25
    X^2-8x+10=0
    x^5=1
    x^4+x^3+x^2+x+1=0
    x^5+x^4+x^3+x^2+x+1=0
    (x-124.772)*10-2=1
    65000=X-(X*(1-20)*0.4-7000)
    50000=X-(X*(1-20)*0.4-7000)
    2x+1(36-x)=94
    2x+(36-x)=94
    2x+(36-x)= 94
    (x-14.4)/14.4=(16.57-x)/16.57
    12.09×c=((3.3+c)×7.92

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