4*5*(n-2)^3-3*4*(n+6)*(n-2)^2+2*3*(8*n+5)*(n-2)-2*(21*n-20)=0
    x^4-16x^3+93x^2-236x+227=0
    5*(n-2)^4-4*(n+6)*(n-2)^3+3*(8*n+5)*(n-2)^2-2*(21*n-20)*(n-2)+(20*n-25)=0
    dddd
    x^5-12*x^4+51*x^3-(19*6-22)*x^2+(14*6-15)*x-18=0
    x^5-(6+6)*x^4+(8*6+3)*x^3-(19*6-22)*x^2+(14*6-15)*x-3*6=0
    3*4*5*(5-2)^2-2*3*4*(5+6)*(5-2)+2*3*(8*5+3)=x
    3*4*5*(n-2)^2-2*3*4*(n+6)*(n-2)+2*3*(8*n+3)=0
    4*5*(n-2)^3-3*4*(n+6)*(n-2)^2+2*3*(8*n+3)*(n-2)-2*(19*n-22)=0
    48000÷x=60000÷x+400
    5*(n-2)^4-4*(n+6)*(n-2)^3+3*(8*n+3)*(n-2)^2-2*(19*n-22)*(n-2)+(14*n-15)=0
    x/48000=x+400/60000
    2*x^4-16*x^3+36*x^2-18*x=0
    (n)^5-(n+6)*(n)^4+(8*n+3)*(n)^3-(19*n-22)*(n)^2+(14*n-15)*(n)-3*n=0
    (n-2)^5-(n+6)*(n-2)^4+(8*n+3)*(n-2)^3-(19*n-22)*(n-2)^2+(14*n-15)*(n-2)-3*n=0
    x^6-13x^5+59x^4+(22-19*7)x^3+(14*7-15)x^2-21x=0
    -x^2+9x-20=0
    2x^4-16x^3+39x^2-29x=0
    x^4-16x^3+92x^2-227x+206=0
    8x^3-96x^2+368x-452=0

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