tan(0.05x)+x=0
    tan(0.8x)+x=0
    tan0.05x+x=0
    x^2-3x-lnx+xlnx=0
    0.64y^3+y²-9y-12.42＝0
    -2x^3+11x^2-13x+2 = 0
    2x^3+11x^2-13x+2
    2x^3+11x^2-13x+2=0
    （165-X）/165=44.5%
    （156-X）/156=48%
    （156-X）/156=48.8%
    （123-X）/123=48.8%
    （123-X）=48.8%
    xxx-4x-4=0
    x-2-(2-x)/2=(x-2)/3
    5x-3(5/21)=5/7
    x(3/5)=20(1/4)
    5x-(2/7)x=3/4
    (3x+5)/2=(5x-9)/3
    3(x+2)/5=(x+2)

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