12x*2+28x-53=0
    （X-3)(X-9)=X-9
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.444
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=81.898
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=83.690
    x^2+3x-2=0
    x/80+X/100=36
    x*x=x-1
    580=100X-4000-12(X*13/100-5)
    x÷(x+705.124)=7%
    12(X*13/100-5)
    580/(X-40-(X*13%-5)*12%)=100
    580/（0.8842X-39.4）=100
    acrtan√10
    xe^x=1
    3:（x+2）=5:7
    x+3=3
    x^13-29x^12+341x^11-2054x^10+6440x^9-8329x^8-4584x^7+22244x^6-14180x^5-5523x^4+9380x^3-3832x^2+643x-37=0
    x^5-15x^4+85x^3-225x^2+274x-120=0
    x^2-10400x+45400000=0

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