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    x^66666666666-99x+89=0
    x^34-99x+89=0
    x^9-99x+89=0
    x^3-99x+89=0
    20000(1+x)^2=28800
    x^4-99x+89=0
    x^4-3x+89=0
    20000(1+x)∧2=28800
    13.5×a×0.65=5.29
    (a-4.5)÷a = 0.15
    (1.25x+x)x4=360
    0.5x^2-1.5x-2=0
    0=-990000/(1+IRR)+152880/(1+IRR)^2+193306.56/(1+IRR)^3+139471.99/(1+IRR)^4+547190.72/(1+IRR)^5
    1/(xe-x)
    3x+4x
    4.2x-x=1.28
    4.2x-x=1.28
    x^2=-1
    [(x-3)/0.2]-[(x+4)/0.5]=1
    5.8×a×0.65=2.9

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