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    16000=(-20x+2400)*(x-60)
    150×7.94+12×c=(150+c)×7.97
    0=3*1.5²+(3+x)*1.5+x
    0=3*1.5²-(3+x)*1.5+x
    14=-0.02x²+18
    -5=x²-2x-3
    12.02c=(3.4+c)×7.98
    151×7.95-12=150c
    151.2×7.95-1.2×12=150c
    s(s^2+20s+200)=(s+2)(3s^2+40s+200)
    x^3-30x^2+200x+2000=0
    50%*(X+1/2X)=240
    1/x+2/(x-2)=1/(x-5)
    1/x+1/(x-0.5)=1/(x-1)
    x^2*(x^4+4x^2+36)=36
    x^2(x^2+1)(0.0625x^2+1)=6.25
    6400/x+x+0.5*x=200
    101.325*x^2/[(1-x)*(10+x)*100]=2.009
    7x+4
    3x²+2x+8=92

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