-2600+500*（x^10-1）/(x^10*(x-1))=0
    3x∧4＋x＝5
    x/4=(24.858+x)*5/98.6
    (21.978-x)/4=x*5/98.6
    2019+x/2019-x＝3/2
    （4/1+x）3/4=3
    a^2-9/a(a+3)^2+6/a(a+3)
    (21.5316-x)/4=x*5/94.5
    x/4=(x+24.4116)*5/94.5
    5x-0.6×3 = 2.9
    6xxx+76xx+4x-1=0
    12*cos(x)^3+5*x=6
    x/4=(x+21.0817)*5/89.1
    (106*0.519+x) /(106+x) =0.6
    cos(x)^3+x=1
    x/57.2=x/62%+100
    （5/89.7）*x=(18.2017-x)/4
    9/8-x=5/8+1/6
    5/7+X=13/14-1/14
    21.6x^3-23.5x^2+8.52x=1

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