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    669=30×(293-x)+5.67×10^(-8)x^4
    669=30×(293-x)+5.67×10^(-8)×x^4
    669+30×(293-x)=5.67×10^(-8)x^4
    16*x^2+x^4=225
    16*x^2+x^4=225/x^2
    e∧x+cosx=0
    e∧x+cosx=0
    ex+cosx=0
    (50-x)(30+2x)=0
    18*x^5-99*x^4+228*x^3-234*x^2+102*x-3=0
    100000=[21990/(1+r)]+[21990/(1+r)^2]+[21990/(1+r)^3]+[21990/(1+r)^4]+[21990/(1+r)^5]
    100000=21990/(1+r)+21990/(1+r)^2+21990/(1+r)^3+21990/(1+r)^4+21990/(1+r)^5
    109950=21990/(1+r)+21990/(1+r)^2+21990/(1+r)^3+21990/(1+r)^4+21990/(1+r)^5
    100000=21990/(1+r)+21990/(1+r)^2+21990/(1+r)^3+21990/(1+r)^4+21990/(1+r)^5
    100000=21990/(1+r)
    2*x^3+5*x^2-20=0
    2*x^3+5*x^2-20=0
    3/5y-2/5y=4
    3/5y-2/5y=4
    3/5y-2/5y=4

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