1+0.156x^2-0.0032x^4=0
    3X+2（1-X）=4
    X^2-X-1=0
    13x-5√(x^2+57600)=0
    13x/√(57600+x)=5
    x*x*sinx
    1+10244x^2-5390x^4=0
    s^6+6×s^4+11×s^2+6=0
    x-lnx=0.5+ln2
    0.00232x^2+0.22x-0.58=0
    2x^2-40x+75=0
    （1-x）(x-1)=x
    x*x=x-1
    -x*x+x-1=0
    [500+20(58-a)](a-35)=8400
    500(a-35)+20(58-a)(a-35)=8400
    (58-a-35)(500+20a)=8400
    x+(4.9/340)*x^2 = 12
    500(a-35)+(58-a)a(a-35)=8400
    500(a-35)+20a(a-35)=8400

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