25x^2-126x-351=0
    sinπx
    （y/5）+（6950-y/8）=1000
    y/5+8/6950-y=1000
    y/5
    5/y+8/6950-y/8=1000
    5/y+8/6950-y/8=1000
    x+2x^2=100
    (X-860)/3000=(X-500)/4000
    9^(2x+1)/10^2x=27/2
    9^2x+1/10^2x=27/2
    (9^(2x+1))/(10^2x)=27/2
    146x+x^2=3848.45×4/π
    x*secx=e
    arctan10x+arctan0.5x=90
    （99330-2.5X）*12/23*0.9=20799+10X
    x²-x-1=0
    x²-x+1=0
    49.875=x*0.95-199.5
    a^2+（2.4a）^2=2.6^2

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