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)
    2(3x-4)+(4-x)=4x
    3(x+1)/(2x-4)=6
    1.7x+4.8+0.3x=7.8
    128-5(2x+3)=73
     x*x-192*x+96*96 = 1.645*1.645*x
    x2-192*x+96*96=1.645*1.645*x
    7(4-X)=9(X-4)

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