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    X+X*2400/1870=755550
    12x^2-14x+3
    -10xx+900x+20000=6750
    110(1+x)²=185.9
    28-x+3.6=20
    140x-2x2-5600+80x=400
    (100%-X)/100%*0.25=(X-85%)/85%*0.5
    4s^3+24s^2+72s+80=0
    ((100%*(10-1)+X)/10-X)/(100%*(10-1)+X)/10*0.25=(X-(85%*(10-1)+X)/10)/(85%*(10-1)+X)/10*0.5
    ((100%*(9-1)+X)/9-X)/(100%*(9-1)+X)/9*0.25=(X-(85%*(9-1)+X)/9)/(85%*(9-1)+X)/9*0.5
    ((100%*(8-1)+X)/8-X)/(100%*(8-1)+X)/8*0.25=(X-(85%*(8-1)+X)/8)/(85%*(8-1)+X)/8*0.5
    ((100%*(7-1)+X)/7-X)/(100%*(7-1)+X)/7*0.25=(X-(85%*(7-1)+X)/7)/(85%*(7-1)+X)/7*0.5
    ((100%*(6-1)+X)/6-X)/(100%*(6-1)+X)/6*0.25=(X-(85%*(6-1)+X)/6)/(85%*(6-1)+X)/6*0.5
    ((100%*(5-1)+X)/5-X)/(100%*(5-1)+X)/5*0.25=(X-(85%*(5-1)+X)/5)/(85%*(5-1)+X)/5*0.5
    ((100%*(4-1)+X)/4-X)/(100%*(4-1)+X)/4*0.25=(X-(85%*(4-1)+X)/4)/(85%*(4-1)+X)/4*0.5
    ((100%*(3-1)+X)/3-X)/(100%*(3-1)+X)/3*0.25=(X-(85%*(3-1)+X)/3)/(85%*(3-1)+X)/3*0.5
    x*0.95=100
    (32-2x)(20-x)=570
    x=x*0.05+100
    (9-2x)(5-2x)=18

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