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    a×0.6=57.9
    a×0.6=37.9
    (x*2*0.75)/2=36
    -2000000×(1+x)+(100×250×30-100×250×10)×[1.1^14-1/0.1×(1.1)^14]×(1.1)^(-1)+200000×(1.1)^(-15)
    arctanx/x
    z^3+0.5*z^2+z+0.5=0
    x^2-29x+100=0
    8*a^3+80*a^2+248*a+210=0
    8*a^3+80*a^2+248*a-30=0
    (x+3-√(x^2+6x-7))^2+16 = (x+6-√(x^2+6x-7))^2
    (x+3-sqrt(x^2+6x-7)^2+16=(x+6-sqrt(x^2+6x-7)^2)
    11000-3180-550-15%x−477−0.21x−318=x
    110000-3180-550-15%x−477−0.21x−318=x
    s^3+7*s^2+15*s+25 = 0
    s^3+7*s^2+15^s+25 = 0
    s^3+7*s^2+15s+25=0
    x^4-2x^3+9x^2-18x+9=0
    2x=7
    0.058x^2-1.9x+1.56=0
    e-10k+e-7k+e-3k=0.15

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