x/24+x*0.0091=7615
     (x*0.2184+x)/24=7615
    3x3x3=13
    (x-53.31)/x=18%
    (x-131)/x=11%
    (x-268)/x=10%
    (x-163)/x=10%
    -5X^3-X-12=0
    4x^2-4x-4=0
    20/133.58+25/1650+X/45+（52.2-X）/1000=0.362
    a×0.60=10.9
    a×0.60=25.9
    a×0.60=18.9
    3x^2-8x=20
    3x^2-8x=-20
    x^3-3x^2-8x=-20
    x^4+x^3+x^2+x+1=0
    x^4+3x^3+6x^2+9x+7=0
    x^4-3x^3+6x^2-9x+7=0
    a×0.60=10.9

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