0.85*44X+0.15*15X=12500*0.52
    0.85*44X+0.15*15X=18014*0.52
    4*(k+1)^2-4*k*(k-1)
    x^2-4>5x+2
    44*0.85x+12*0.12x=13000*0.52
    44*0.85x+12*0.12x=18000*0.52
    42*0.85x+12*0.12x=18000*0.52
    42*0.85x+12*0.12x=13000*0.52
    3x+9=12
    -4.01e(82/-113.61)+4.26
    -80.99e(28/-53.84)+76.01
    -199.36e(25/-36.99)+214.28
    -4^2
    4--4^2
    4--4
    2^3sin30
    2^3
    5+3
    cos120
    4.9x^2+340x-680=0

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