(x+1)^(2)≥0
    -2x^2+4x+6=9-6x
    5+70%x＝54
    5+70%x
    x^(2)+2x+1≥0
    (162*0.481+x) /(162+x) =0.6
    -x^2+2x+3=9-6x
    x^(2)>2
    -100+38*（x^8-1）/(x^8*(x-1))=0
    x∧4＋（3∧0.5）x＝15
    96-x=50
    （3*1000-X*5）/(1000-X)=2
    (77*0.506+x) /(77+x) =0.6
    4xx＋8x＋12＝0
    x^(2)-13.6x+36=0
    (178*0.449+x) /(178+x) =0.6
    -x2+13.6x+36=0
    -3600+780*（x^10-1）/(x^10*(x-1))=0
    -3300+620*（x^10-1）/(x^10*(x-1))=0
    (810*0.541+x) /(810+x) =0.6

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