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    x^2+8x+sqrt(x^2+8x)=12
    20=40log400x
    20=40log(400y/720)+1.2
    20=40log(400x/720)+1.2
    20=40log(400x/720)
    (x-38.79)*x=0.3424
    6000=A-(A*2%)-((A-800-A*2%)*10%)
    1400*130*(x-130/2)+200*x^2=6.6667*6182(1480-x)
    800x^2=6.6667*6182(1480-x)
    1400*130*(x-130/2)+200*x^2=6.6667*6182*(1470-x)
    1400*130*(x-130/2)+200*4x^2=6.6667*6182(1470-x)
    1600*x^2/2=6.6667*6182*(1470-x)
    (180+308.5)/30*x+199/30*(x+15)+104/30(x+30)=890
    x^3-3x-5=0 2
    
x^(x^4)=65536 (-2)^((-2)^4)
    x^(x^4)=4 (-sqrt2)^((-sqrt2)^4)
    x^(x^4)=4
    x^(x^4)=2^(-1/8)
    x^x^4=2^(-1/8)
    (3x-6)/(x+7)=3 (4x-3)/(2x+6)=2 (7x-5)/(x+4)=7

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