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    cos(2*x)+cos(x)=0
    (t-6)^3-12(t-6)+16=0
    3x^(2)+2x-1<0
    -4.245((0.44-0.0167x)sin(140.454/(15-0.3x))-0.0823x)+0.9=3.34
    -4.245(sin(140.454/(15-0.3x))-0.0823x)+0.9=-3.34
    -4.245(sin(140.454/(15-0.3x))-0.0823x)+0.9=3.34
    1200=120/i[1-1/(1+i/2)^20]+1000/(1+i/2)^20
    1200=120/i[1-1/(1+i/2)20]+1000/(1+i/2)20
    -4.245268(sin(140.454/(15-0.3x))-0.0823x)+0.9=3.34
    120/i[1-1/(1+i/2)10]+1000/(1+i/2)10=1200
    1+X=7.5X
    (1.1085 * 4144.96) + (1.0765 * x) = 1.0999 * (4144.96 + x)
    1.5a/(a-400)=0.7
    2x^2+12x-14
    x=-10996*(1.128^(-1))-31011*(1.128^(-2))
    (21+d)(21+4d) <(21+11d)
    x=-10996*(1.128^(-1))
    0.4-0.5*a=0
    565x+9000=28280
    565x+9900=28280

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