-1x=10
    -1x=10
    x(10+x)^2=12.1
    x(10+x)^2=12.1
    0.3x=0.045
    0.3x=0.045
    x^2+1/x=2
    lnx+1/x=0
    （X-240）*0.75/2250=（X-240-100）*0.75/2000
    （EBIT-240）*75%/2250=（EBIT-340）*75%/2000
    -286x^2+4x^4 = -1280
    2/3x+2=3/4（x-3）
    （x+10）/2=6
    9x ²+47x-56=0
    62.5%x+75%（84-x）=58
    x÷48-x÷（48+12）=5
    x÷48-x÷（48+12）=5
    2-2*x=sqrt(2)*sqrt(1+x^2)
    -1+b=-2
    X/0.55=(1000+X)

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