1/6x+1/12x+1/7x+5+1/2x+4=x
    4x^2=9+x^2
    i(1+i)^10/((1+i)^10-1)=5
    2.5x^3+323.7x-872.4=0
    x-(x-800)*20%=4800
    0.12706/x＝0.1289/0.86289
    0.12706/x＝0.1289/0.86289
    0.4/100.58＝x/31.95
    0.4/100.58＝x/31.95
    (25.343+x)×2.65＝50.687+69.08-x
    (25.343+x)×2.65＝50.687+69.08-x
    （25.343+x）×2.65＝50.687+69.08-x
    X-X(1-20%）*20%=10080
    X-｛X*(1 - 20%) × 30% - 2000｝=48287.04
    1/(2^x+1)
    1.31-cost-cos(72-t)-2√(1-cost)√(1-cos(72-t))
    34.53(sqrt(1-cos(72-t))-√(1-cost))=625+4768.7(1-cost)-3453√(1-cost)cos(76.5+0.5t)
    ((a)/(2))(1+ln((a+3)/(a)))=((18^(2)-(a+3)^(2))/(96.24-4a)
    ((a)/(2))(1+ln((a+3)/(a)))=((18^(2)-(a+3)^(2))/((96.24-4a)))
    450*（1+X）^3=510

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