x²-80x=-500
    (x+5)²=2x²
    x-10/x=0.3
    180x+300(13-x)=2850
    x^3-x-1=0
    x+0.08x=4580
    （1-3y）2+2（3y-1）=0
    2x^3+3x^2-3x-2=0
    x^2-4x+5=0
    X-X/1.09*0.09=50069.5
    X-X/1.09*0.09=19812.11
    X-X/1.09*0.09=16859.52
    X-X/1.09*0.09=16,859.52
    X-X/1.09*0.09=18038.9
    X-X/1.09*0.09=1431.19
    X-X/1.09*0.09=149919.5
    X-X/1.09*0.09=7989.36
    X-X/1.09*0.09=15055.42
    X-X/1.09*0.09=6422.02
    xtanx=6

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