x/(x+1)=0.895
    x/x+1=0.895
    sin(0.4495/x)=0.4385/x
    sin(0.1983/x)=0.1974/x
    sin(12.10132/x)=11.76865/x
    x=2
    1187x+1043（1-x）=1126.11
    1/x=-2log(0.15/3.71/0.04+2.51/10624/x)
    x²+x＝84
    0.4x+0.6x=84
    1.8＝－1/20（x－10）²+5
    0.4x+0.6x=84
    s^3+s^2+4s+4=0
    x-x*0.08=10000
    35+16x-3x^2=0
    0.38×0.1∧x-0.42×55∧x=0.149
    x＾x=5
    x＾x=1
    xx=1
    （1+x)^2 = 3

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