（26.7-x）×1.5％＝x
    （26.7-x）×1.5＝x
    (x*1.2*0.9-x)+(2000-x)*1.15*0.9/（2000-x) = 131
    (x*1.2*0.9-x)+(2000-x)*0.15*0.9= 131
    (x*1.2*0.9-x)+(2000-x)*1.15*0.9-（2000-x) = 131
     (x*1.2*0.9-x)+(2000-x)*1.15*0.9-（2000-x) = 131
    （2000-x)*1.15*0.9-（2000-x)
    （4.07-x）*85=75
    13.15c=（3.3+c）×7.97
    （X-40）*0.25 = 0.32X-24
    sqrt(2X^2+16+8x)-4sqrt2 = 0
    sqrt(2X^2+16+8x)-2sqrt2=0
    x^2+4X+8-2sqrt2
    （32%x-24）/（x-40）=25%
    -9x^2/(x-4)(x+1)^2 +9/2x-8 =1
    sprt(2)
    ㏑x=(1/x)+1
    x*(e^x+tan(x))(e^x+tan(x))-1
    （3x+2）/4=8
    （3x+2/4）=8

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