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    (y-31.99)/31.99*100-(-2.66)=(y-31.14)/31.14*100
    (195+306)/30*x+150/30*(x+15)+120/30(x+30)=1255
    (y-46.57)/46.57*100-(2.13)=(y-47.56)/47.56*100
    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

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