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    -m2-6m-3+(-3)=2
    -m^2-6m-3-(-3)=2
    6-m^2-6m-3=2
    6+m^2-6m-3=2
    (10+x)(300-10x)=3360
    x*x*x*x-2x*x-9x+1=0
    36-(0.5(10-x))²=64-(0.5(10+x))²
    xx+31x-160=0
    x
    (2/3x+500)*8/9+400=2x
    (2/3x+500)*8/9+400
    x(x-1)0.5=780
    2. 5x-1.25 ^ 2-1.25=0
    38+x=3*(10+x)
    1000/(1+r)+1000/(1+r)^2+1000/(1+r)^3 = 2673
    1000/(1+r)+1000/(1+r)^2+1000/(1+r)^3 = 2674
    -5x=61-56
    -x²-40+12x=0
    X²+27-12x=0
    (x+300+90+87+92)/7=94.5

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