xcosx
    528+480/x=-0.04(70+525x/(12.5+5x))^2+14(70+525x/(12.5+5x))
    528+480/x=-0.04(70+525x/(12.5+5x)x)^2+14(70+525x/(12.5+5x))
    528+480/x=-0.04(70+525x/(12.5+5x))^2+14(70+525x/(12.5+5x))
    （34983-X）/X=0.7
    n²+n-110＝0
    n²+n-100＝0
    sin(x)=0.83
    2.4x²-14.79x+11.35＝0
    1/9+(8/9)=x
    (17390-X)/X=0.55
    (15926-X)/X=0.55
    lo3-log3
    9x=1
    x=6^2 1+1 1-1.5
    x=6^2 1+1 1-1
    x=6^2 1e3/(10^3)
    x=6^2
    k+1=1/3
    nan+1

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