(x+2)÷3=2x
    (1/3)*(4x)^3-2x*(4x)^2+2=0
    64/3x^3-32x^3+2 = 0
    64/3x^3-32x^3+2=-286
    42=12x+4x
    （80+70）÷（90%-75%）=x
    （80+70）÷（80%-75%）=x
    （80+70）÷（80%-75%）=x
    (58-x)(400+20x)=8400
    2x*9+x-36=250
    A²+A＝240
    2x*9+x-36=250
    x*x-670x+23300=0
    (x-120)*(-2/25x+44)=2400
    x*x-670x+23300=0
    lnx=-x
    x/2.7+748/7.9-x/7.9=200
    7+3x+6=5+4x
    (X-160000)*(1-0.25)/250000=(X-360000)*(1-0.25)/200000
    (X-160000)*(1-25%)/250000=(X-360000)*(1-25%)/200000

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