0.3/(2000-p/2000)=-2
    0.3/(2000-p)/(2000)=-2
    0.3/2000-p/2000=-2
    0.3/2000-p/2000=-2
    X*6%+X=900680
    x-(x*0.15）=5000
    x*0.15-(x*0.15）=5000
    0.15-x*0.15=5000
    （103124-2.5X）*12/23*0.9=23532+10X
    4 X + 3 X = 1 2
    （19 ÷11）x+x=19 ÷11
    3（x+2）²+12=0
    190 ÷110=X ÷（1-X）
    190 ÷110=X ÷1-X
    X+1+2x=3x
    1+x+2x+3x+4x+5x=6x
    1+x+2x+3x+4x=5x
    X+x+2x+3x+4x=5x
    X+2x+3x+4x=5x
    a^2-2020a+1＝0

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