x^2-10x+25-64/5-x
    x^2-10x+25-64/5-x=0
    arctan(0.5w)＋arctan(w/6)=39
    x^2-6x+8=0
    arctan(0.5w)＋arctan(w/6)=49
    66.26*x➗1608.9=0.0177
    arctan(0.5w)－arctan(w/6)=49
    arctan(0.5w)－arctan[(1/6)w]=49
    arctan(1/2w)+arctan(1/6w)=38
    arctan(0.5w)+arctan(w/6)=40
    x*x*(1+0.25x*x)*(1+(x*x)/36)=49
    750-750÷1+x-30x
    28125x-x*x/2=1
    s×s=－182.80
    x/（（0.01-x）（0.78-4x）=5.66×10^29
    (268.7-6k)(769+196.15k)-32.69*768.91k=0
    (268.95-6.12K)×(200K＋770)－(32.7×770K)=0
    (268.95-6.12K)×(200K＋770)－32.7×770K=0
    107.47x*x-18417.11
    -1224(K×K)＋23898.6K＋207091.5＝0

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