（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
    x²+4x-92=0
    [（X+113847.28）/1.13*0.13-50979.22]/(X+113847.28)/1.13=0.016
    x²-24x-44=0
    x2-24x-44=0
    (4X+1)(4X+1)-8(2XX-1)
    [(1-x²)/x]²+{[1-x*√(1-x²)]/x}=13
    1/5x－x

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