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    10*(1+7%)*(1+8%) = 10*(1+x)*(1+x)
    10*(1+7%)*(1+8%)=10(1+x)²
    x^3+21*x/100+11/200=0
    x^3+2*x^2+13*x-24=0
    0.932919x^2-474x+50801.9724=0
    0.932919x^2-474x-50801.9724=0
    29x+13=34x-17
    37(x-4)=111
    15(x-3)=75
    21(x+3)=63
    1/2x²+x
    (4x-15)4=x
    (4x-15)X4=x
    X+(5000-120X)/10000=3.4540
    X+(5000-60X)/1000=3.4540
    (4x-7)/((20x^2-72x+81))^1/2=(18-x)/((17x^2-100x+452))^1/2
    (4x-7)/((20x^2-72x+81))^1/2=(x-18)/((17x^2-100x+452))^1/2
    (4x-7)/(20x^2-72x+81)^1/2=(18-x)/(17x^2-100x+452)^1/2
    (4x-7)/(20x^2-72x+81)^1/2=(x-18)/(17x^2-100x+452)^1/2
    0.16x+54.4+66.6/39.22=12.8x-246/795

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