1+2X=36
    1+2X=36
     （x+700）/19*5-4494*0.105=1952.16
     （x+700）/20*5-4494*0.105=1952.16
     （x+700）/21.75*5-4494*0.105=1952.16
    （x+700）/20*5-0.105x=1952.16
    （x+700）/20*5-0.105x=1952.16
    （x+700）/20*5-0.105x=1952.16
    （x+700）/21.75*5-0.105x=1950
    （x+700）/19*5-0.105x=1950
    4x+4=2x
    2+2x=2
    x²-1/3x²
    (x*x-x)/2=90
    x*x-x=90
    10x-x*x=24
    10x-x*x=24
    (x/2)*((10-x)/2)=12
    (x/2)*((10-x)/2)=12
    (x/2)*((10-x)/2)=12

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