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    tanx=7
    15+8/(2x)=8/x
    x^2+5x=-4
    15+(8/2x)=8/x
    15+8/2x=8/x
    x^2+5x=-4
    (140-100-a)(300-2a)=1200
    1+1/(x-1)+1/(1+1/(1+1/(x-1)))=0
    (4x+5+3):(5x-3)=5:3
    x/(2x-1)-3/(4x²-1)=3/(2x+1)
    a×0.54×0.6=10.9
    a×0.55×0.6=10.9
    33.6×a×0.6=10.9
    0.75x+80=0.9x-220
    16 ( 20-x )=264
    200x-2x²=5200
    99.26*t^3=4*t^2+4*t+104
    (15+x)×(35+x)=1125
    (x-4)(-50x+1200)=1800
    (-18x^3+47x^2-141x+605/4)/(9sqrt(x^4-6x^3+45/2x^2-89/2x+821/16))=3/sqrt2

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