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
    15-124000x=1+(2x/0.0001)^(1/2)
    x=0.00005(14-124000x)^2
    x=50*10^(-6)(14-124000x)^2
    0.14-1240x= (2x)^(1/2)
    cos x /(sin x +1)^2=5/16
    4.3761=（30.56*0.847*（x+0.1））/（1+0.847（x+0.1））*（100-1.4-8.28）/100*1/(1+0.31*1.4)+（2.26（x+0.1））/（1.3*0.101325）
    15x²-6x-1=0

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