（37+y）/（141+y）=45%
    （27+y）/（141+y）=45%
    x^2=2/3
    1-2x+x^2=2/3
    a^2-11a+7=0
    a^2-11a+8=0
    a^2-10a+8=0
    （1+x）^-1（1-（1+x）^-10）/1-（1+x）^-1=5/2
    4.7x+600=8x+500
    4.7x+600=500+8x
    0.047x+600=500+0.08x
    (53-x)/x=0.309
    4x^2-24x+27=0
    249x²-570x+350
    42x=1800
    4x^3-3x^2+4x-1
    -2xx+274x-3000=5700
    x^3+3x^2-3x+4=0
    17x^3-307x^2+1783x-3301=0
    2x^5+91x^4+793x^3-6191x^2-80171x-162268=0

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