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    (-2x-2)*(-2x-2)+(1-x)*(1-x)=16/5
    x-1≥x-2/2+3
    tanx=x
    x^2+267987.58-4218x=0
    3/8:x=5%:0.6
    n^3-n^2-12n-24 = 0
    60x=(x-4)×(60+12)
    n^3-n^2-12n-24=0
    3.67 = 50 + x * 200
    0.000631*(0.15-x)=x*x
    5/(1+R)+5/(1+R)^2+105/(1+R)^3=110
    -14700+5800÷(1+x)+5300÷(1+x)^(2)+4300÷(1+x)^(3)+3700÷(1+x)^4=0
    -x^2-3x+4=0
    lg(x+1)=0
    22*a^3+65*a^2+63*a+21=0
    12 + 0.035 * 200 = 50 + x * 200
    2x+75%xx5=460
    7.14*(37x)^(5/3)/(2x+37)^(2/3)=668
    110*(1+r)*(1+r)*(1+r)=5*r*r+15*r+125
    x^2-1=2x*lnx

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