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    2x^(2)+5x=-2
    (x-1)(6/x+2)=8
    (x-1)( 6 x +2)=6+2
    x^(2)+3x-4=0
    x^2+15x+70=0
    (38-x)(22-x)=665
    2x/1-x^(2)=-12/15
    -x^2-3*x+4=(3/5)*x+12/5
    12m^2+11m-16=0
    x^(2)-14x+48=0
    12^2m+11m-16=0
    x2-14x+48=0
    x^2-x-12=0
    x*x-2.19x+0.8182=0
    a-√4-a=1
    n^2+2n-440=0
    7n^2+4n-880=0
    6x=1
    1200=1000/(1+r/2)^40+100/2*(1-1/(1+r/2)^40)/(r/2)
    50x^2+x-0.77/2=0

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