0.131/x＝0.1289/0.86289
    0.4/100.58＝x/32.95
    0.1312/x＝0.1289/0.86289
    0.4/100.58＝x/33
    x^((x-1)^2)=2x+1
    sqrt(1-(x/2)^2)+sin(x)=0
    2∧x-1
    (1/4)*sqrt(4^2-x^2)+sin(x)=0
    (X+10) (25-x) =176
    （18-2x-15）（54-4x）=400
    2x^2-230x+6608=0
    （X- 40）×【300+20×（60 -x）】=6080
    x+x^2+x^3+x^4+x^5=5.1835
    320989741x=999999999999999983
    432809599x=1999999999999999999
    127x=1
    7x=1
    1518x=1
    52x=1
    2x=588888

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