(x+128x)+2x+x＝1600
    x*（0.0667+x)=1.8*0.000000333
    8.721x^0.365+x=0.5
    (7.6224+0.7378*y)*y=133.3
    （(2093+411-121-X-6140)/6140)*0.5=((1845+X)-3716)/3716
    (x+88)/(1-0.3%)*0.3%=
     3×x^2-44x+160 = 0
    5+6=8x
    [(81644.43+a+10000)-45000]*10%-2520 =1644.44+a
    5+8=9x
    [(81644.43+a+10000)-45000]*10%-2520 =1088.89+a
    [(81644.43+a+10000)-45000]*0.1-2520 =1088.89+a
    [(67789.35+a+843+8000)-45000-7587]*3% =631.37+a
    （16+x^2）（25-10x+x^2）=64+4x^2
    x^4+6x^2+25=0
    x+x*0.06=59850
    x^2+2x+1=0
    11000-3180-550-15%x−477−0.21x−318=x
    70*Q-(20*Q+300+516.48)-(70*13%*Q-2Q)*10%=464
    22342.2-x/x=0.06

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