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    2^x+2^-x
    x+578x÷2080=80
    (x+60)(10000/70)+x(150-10000/70)=35200
    25×9+25×81(1-x^2+4x)^2=16×(1+9x^2)^2
    X^5-3x^2+1=0
    X^2-4=0
    AX15.9374=100
    (sqrt(5)-x)^2-1+sqrt(5+x^2) = 3
    (sqrt(5)-x)^2-1+sqrt(5+x^2)=3
    (1+2*j)^2
    ((1+x)/(1-x))^(1/x)
    5*t∧2=0
    5*t∧2+3t+3.8=0
    lnx=3.48
    x^ln(3)+x^ln(4)=x^ln(5)
    (x+2)^2=4(x-2/3)
    (x+2)^2=1/4(x-2/3)
    ln(x-2)/x
    0=1*x*(1-5%)-(140*1-50)
    X-(500+600+0.3X+0.5X*0.2)=0.7X

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