(sqrt(x^2+1)+x)=1/(sqrt(x^2+1)-x)
    arctan(2x)-arctanx=arctan(x/(1+2x^2))
    （1.5－x）÷2＝1.05－x
    49.875=x*0.95-199.5
    6700/（x+11.88)+10000/(x+11.88)+10000/(x+11.88)=150
    6700/（x+11.88)+7500/(x+11.88)+10000/(x+11.88)=150
    6700/（x+11.88)+10000/(x+11.88)+10000/(x+11.88)=150
    2200=x/110*1000
    x²＝4
    x²＋x＝1200
    x²＋x＝600
    36x²－126x+29=0
    90*X+90*(X-2)=160*X
    0.8(1+x)/(0.12-x)=29.07
    0.8x(1+x)/(0.12-x)=29.07
    0.8x(1+x)/(0.12-x)=29.07
    0.8x(1+x)/(0.12-x)=29.07
    （X-300）*0.75/1000=（（X-300）*0.75-480）/800
    （X-300）*0.75/1000=（X-300）*0.75-480/800
    1x-900-(1x/1.13*0.13-1*50)*0.1=0

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