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    3x^2+x+3=x(x+3)
    3x^2+x+3=3
    a∧5=8
    (140-100-a)(300-2a)=1200
    x×x+x(x+7)=36
    (429.193-427.293)*(y-600)/(667.79-600)+427.293=
    1/2x^2-4x+7=1/2x
    2.78x÷(x+1400)=230
    (1+(2.78(x+187))/(x+1587))/(1+(2.78x)/(x+1400))=1.12
    (1+(2.78*(x+187))/(x+1587))/(1+(2.78*x)/(x+1400))=1.12
    (1+(2.78(x+187))/(x+1587))/(1+(2.78x)/(x+1400))=1.12
    x*(1+x)^6 = 5(1+x)^6-5
    x*(1+x)^6 = 5(1+x)^6-5
    x*(1+x)^6=5(1+x)^6-5
    x*(1+x)^6=5(1+x)^-5
    x²-x-1=0
    a^2+a*7—17750=0
    750x/1+x +30x
    (1+(2.78*(x+20))/(x+1420))/1+(2.78*x)/(x+1400)=1.12
    (1+(2.78*(x+20))/(x+1420))/1+(2.78*x)/(x+1400)=1.12

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