b9=27
    b9=21
    x+2=11 bx=27
    a5+15=100
    a5+15=100
    x^3-20*x^2-16025*x+806250=0
    5a-15=100
    x=5 ax+15=100
    3(5x-5)=7(2x+1)
    5(x-7)=2(x+5)
    4(5x-2)=15x+22
    9x-21=3(2x-3)
    x²+1.8×0.00001×x-3.6×0.000001=0
    x^3-100x-24000 = 0
    x*0.94*1.81*1.3=2.2
    x*0.87*1.81*1.3=2.2
    95×1000000=14.3×250X×（465-X÷2）
    173000*sin(x)-50000*cos(x)-7700=0
    2.14*(0.15-x/6.5729)/(1/6.5729)^(1/3)/(2500/1600)^(2/3)=18-1.52*ln(3.9737/5*x)
    2.14*（0.15-x/6.5729)/(1/6.5729)^(1/3)/(2500/1600)^(2/3)=18-1.52*ln(3.9737/5x)

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