√2x-x²=1÷3
    √2x-x²=1÷3
    √2x-x²=⅓
    7200/x=10000/(0.7+x)
    1/(x+1)-(x+1)/(2x-2)=1
    4/x = 3/[√(9+x*x)-3]
    4/x=3/(√(9+x*x)-3)
    1083.334＝499.685+359.334+0.5*33.551x×x
    2x+arctan6x=0.5×3.1415926
    x*4*0.01+16=300000
    (8/(4+x))^2*x=4
    -4arctan1.618-1.618x+π=-π
    -4arctan0.618-0.618x+π=-π
    x^5+10x^3+20x-4＝0
    -arctanx-0.8x=-π
    -arctanx+0.8x=π
    -arctanx-0.8x=π
    arctanx-0.8x=π
    arctanx-0.8*57.3*x=180
    0.1271/x=1.015

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