3q^2-40q-400=0
    ln(x)＝3.8711
    x+0.2x=1071
    6^2+x^2=(5-x)^2
    6²+x²=(5-x)²
    6x/500-96/x^2=0
    (35.2×0.025-2x)÷(19.6×0.025+9.8x)=0.05÷(0.1+x)
    -3x=-12/x
    (lnx-1)(1-x)＝-1
    lnx＝1
    x^3-4x^2+5x-2=0
    25x^2+100x-476=0
    x+x*0.09=50889
    x+x*0.09=25900
    x+x*0.09=71960
    x+x*0.09=87864
    2x^3+11x^2+20x+8=0
    x+x*0.09=21966
    x+x*0.09=20000
    x+x*0.09=8000

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