410-3X=170
    (8950+20+X)*（3.9%-3.1%）=4X
    (8950+20+X)*3.1%=4X
    43X+7=32-2X
    (8950+20+X)*3.9%=4X
    x+8=x+6
    1990+X+(1990+X)/26*1.3=3000
    8/X=40/111
    （1-x^3）^2/3
    0.08/X=40/111
    5x+5
    8%/X=40/111
    8xx-51x+74=0
    3×(5^p)+p=378
    -300+x-x*2%-800*2%=30
    -2a∧3+(2-a)a+1=0
    -2a∧3+(2-a)a+1=0
    4（2x^2-2x-1）^2=（2x^2-2x-7）（4x-2）^2
    691X-691*1.436=483X-483*1.4327
    451X-451*1.439=315X-315*1.434

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