x*x*2*4.5=13410/3
    10%=0.53×(1+x)÷16.20+x
    (1087.05+217.411+x)(1087.05+x)/(434.822-x)=27.18*100*10000
    (1087.05+217.411+x)(1087.05+x)/10000/(434.822-x)/100=27.18
    x+0.05x=3.99
    x+0.03x=3.99
    x*x*2*4.5=17880/3
    18.7^(2)+(r-7.2)^(2)=r^(2)
    x*x*2*4.5=17880
    x^3-3x^2+1
    10/(Z-1)+(10*Z-10)/(9*Z)-(Z-1)/(90*Z)+1=0
    10/(Z-1)+(10*Z-10)/(9*Z)-(Z-1)/(90*Z)=0
    10/(Z-1)+(10*Z-10)/(9*Z)-(Z-1)/(90*Z)+2.1=0
    32*Z^2+57*Z+11=0
    32*Z^2+57*Z+11
    3x^2+6x+8=0
    2.5xln(25x/0.001006)+3.5x=1.7
    700x^5=177x^4+674x^3+980x^2+828x^x+809
    5000(1-x)+5000(1-x)^2=4050
    3.1*(x^2)-4.22*x+11.12=0

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