Mathematics
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    -2x^3-2x^2+4x-1
    -2x^3-2x^2+4x-1=0
    23.1^x=-1
    X^2+10x=58
    50/X=5/20
    100*(1+x)^3=133.1
    C(79,9)=
    C(79,9)
    C(79,9)
    C(79,9)
    70%-15%+((1+X)/X)*8%*(1-37.5%)=0
    x*x-96.8*x-56.1*56.1=0
    x*x-97.6*x-37.55*37.55=0
    14×x×x-15x+3=0
    (x-4)^2/7x^2-8x+8=6/49
    tanx *tan(90-x)
    4x^2+17x=0
    X-5=xx
    tanx=sin70/(1-cos70)
    (8-2X)(6-X)=30

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