5x-0.16x^2=26
    17/16x^2+x/3-5/9
    2x^2+2x+3=0
    5.546=（（0.021*x^1.85+955.4）^0.5）*x^0.84
    1041=（（0.021*x^1.85+955.4）^0.5）*x^0.84
    x+50+x=x+60
    -151.2+x*(1-0.8%)=50
    5x+10=8(x-3）-2
    x^2-6*x+9=(2*x-1)^2
    2*x^2-4*x-1=0
    X-X*0.2-6=21956.39
    X-X*0.2-5.8=6708.55
    X-X*0.2-5.4=6568.84
    X-X*0.2-8.7=13438.79
    X-X*0.2-9.9=14744.78
    X-X*0.2-9.9=7521.28
    X-X*0.2-13.5=15507.07
    X-X*0.2-13.4=15318.37
    X-X*0.2-13=15646.72
    X-X*0.2-10.6=6348.73

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