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    100*(1+(1+x)^2+(1+x)^3+(1+x)^4)=368
    17=10lg(1+2x^(2))
    x^2-80*x+125=0
    333X4
    100*(1+(1+x)^2+(1+x)^3+(1+x)^4+(1+x)^5+(1+x)^6+(1+x)^7+(1+x)^8+(1+x)^9)=6000
    100*(1+(1+x)^2+(1+x)^3+(1+x)^4+(1+x)^5+(1+x)^6+(1+x)^7+(1+x)^8+(1+x)^9)=600
    100*(1+(1+x)^2+(1+x)^3+(1+x)^4+(1+x)^5+(1+x)^6+(1+x)^7+(1+x)^8+(1+x)^9)=3000
    100*(1+(1+x)^2+(1+x)^3+(1+x)^4+(1+x)^5+(1+x)^6+(1+x)^7+(1+x)^8+(1+x)^9)=300
    160/x+320/1.2x=18
    160*1.2x+320x=18*1.2*x*x
    x+x=50
    (x+15)(300-10x)=5000
    x/(0.895*102446)+400*x/(1.05*1430000*(1-0.8*x/14980))=310
    600x=360(x+40)
    3x^(2)-67x+72*4
    x÷15+x÷12+x÷10=1365
    5X9
    t*(e^(t-3))-1=0
    254.9=7.5x^2+97.545x+219.14
    s^3-7s^2+5s-9

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