4x^2+27x-9=0
    -1/4*(x+2) =-(x+3.5)^2+17/4
    -1/4*(x+2) =-(x+2.5)^2+17/4
    (-2-x)/4 =-(x+2.5)^2+17/4 -2
    (2-x)/4 =-(x+2.5)^2+17/4 -2
    (x-2.5)^2 = 0
    (2-x)/4 =-(x+2.5)^2
    x^2-1
    2/3+2=2(m-2/3)
    （2-√3）×（6+m+√3）
    1/2-2x(sqrt(1-x^2))=x
    x÷3+x÷4=420
    【(x-10000*6%-4000/1250*1000*9%)*(1-25%)-6000*10%】/1000=[(x-10000*6%)*(1-25%)-6000*10%]/1400
    【(x-10000x6%-4000/1250*1000*9%)*(1-25%)-6000*10%】/1000=[(x-10000*6%)*(1-25%)-6000*10%]/1400
    lnx+2/x-2=0
    lnx+2x-2=0
    lnx+x/2-2=0
    lnx+2/x-2=0
    (x−300)×0.75/3300=【(x−300)×0.75−75】/3150
    (x−300)×(1−0.25)/3300=((x−300)×(1−0.25)−75)/3150

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