x^6+100.01x^4+x^2-100=0
    (x - 1)(x + 1)
    450/x-450/x+5=1
    1/3(x+7)=2/5-1/2(x-5)
    3x-3=3
    3(20-y)=6y-4(y-11)
    -3x-5=3
    -5-3x=-x
    50x-30x-951-(0.65x-0.25x-15)=0
    50x-30x-951-(0.65x-0.025x-15)=0
    50x-30x-951-(0.65x-0.024x-15)=0
    50x-30x-951-(14.6x)=0
    50x-30x-951-(-14.6x)=0
    50x-30x-951--14.6x=0
    x*235.0439+（1-x）*238.0508=238.0289
    X-6.5%X=498000
    （x+3）²+16（x+2）²＝25²
    (x^2-6)*(2*x-3)=-3
    2a^2=2*23.8^2
    2a^2=23.8^2

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