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    12.1x=(3.5+x)×7.97
    12.1x=(3.5+x)×7.98
    54.3×7.84+12.1x=(54.3+x)×7.97
    54.3×7.84+12.1x=(54.3+x)×7.98
    54.5×7.84+12.1x=(54.5+x)×7.97
    54.5×7.84+12.1x=(54.5+x)×7.98
    16x+x*x=225
    1000/(1000+x)=0.7
    15x/(15x-4200)=1.25
    3.5x^2-12x-5.5=0
    0.5*x^2+30*x+8=1200
    50×50+(50+10t)²=(340t)²
    (X-3)+(x+3)+x/3+3x=48
    (X-3)+(x+3)+x+x/3+3x=48
    X-3+x+3+x+x/3+3x=48
    X-3+x+3+x+48=48
    X/3+3x=48
    3x^4+10x^2-40x+16=0
    X-3+x+3+x+3x=144
    (1+r/4)^4-1=10.25%

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