3988（2-x）=20000x
    5(x+2)=3(x+4)
    6600*(x+1)^2+6930*(x+1)+7276=10000*(1+x)^3
    π-x
    5sinx-sin5x
    (480*37-x)*0.9+36*37=14405.21
    （480*76-x）*0.85+18*76=28981.08
    （26.274+x）×3.15＝52.549+71.623-x
    （26.274+x）×2.95＝52.549+71.623-x
    （26.274+x）×2.75＝52.549+71.623-x
    （26.274+x）×2.55＝52.549+71.623-x
    （26.274+x）×2.35＝52.549+71.623-x
    cosx/x²+1
    （x-190.972）*10-2=2
    （x-190.972）*10-2=1
    84.1 = 37.717ln(x) - 10.294
    50= 37.717ln(x) - 10.294
    84.1 = 38.56ln(x) - 11.728
    50 = 38.56ln(x) - 11.728
    x×0.5%＝550

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