0.39x+lnx=-2.98
    5＝3x－2
    x1222
    x×8+（250-x）×3.8=2080
    （12803-X）/X=0.96
    -x^2-7x-8 =-4x-6
    -x^2-7x-32/4 =-4x-6
    -(x^2+7x+49/4)+17/4 =-4x-6
    -(x+7/2)^2+17/4 =-4x-6
    -x^2-7x-9 =-4x-6
    -(x+3.5)^2 +17/4 =-4x-6
    -(x+3.5)^2 +17/4 =-4x+6
    6x^2-32x-118=0
    6x^2-32x-32=0
    6x^2-32x-29=0
    6x^2-32x=0
    -(x+3.5)^2 +17/4 =-4(x+2)+2
    4*x^2+27*x+38=0
    4*x^2+27*x-11=0
    4*x^2+27*x-9=0

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