3*4*5*6*7*(n-2)^2-2*3*4*5*6*(n+8)*(n-2)+2*3*4*5*(10*n+18)=0
    (2-a)/(2+1)=1/3
    4*5*6*7*(n-2)^3-3*4*5*6*(n+8)*(n-2)^2+2*3*4*5*(10*n+18)*(n-2)-2*3*4*(38*n-6)=0
    x/(x-1)=3/(2x-2)-2
    5*6*7*(n-2)^4-4*5*6*(n+8)*(n-2)^3+3*4*5*(10*n+18)*(n-2)^2-2*3*4*(38*n-6)*(n-2)+2*3*(68*n-64)=0
    36/x-36/1.5x=3
    2/(m+3)+1.5=7/(2m+6)
    6*7*(n-2)^5-5*6*(n+8)*(n-2)^4+4*5*(10*n+18)*(n-2)^3-3*4*(38*n-6)*(n-2)^2+2*3*(68*n-64)*(n-2)-2*(58*n-62)=0
    12/(x^2-9)-2/(x-3)=1/(x+3)
    x^6-22*x^5+198*x^4-940*x^3+2508*x^2-3606*x+2201=0
    7*(n-2)^6-6*(n+8)*(n-2)^5+5*(10*n+18)*(n-2)^4-4*(38*n-6)*(n-2)^3+3*(68*n-64)*(n-2)^2-2*(58*n-62)*(n-2)+(22*n-15)=0
    x/(2x-3)+5/(3-2x)=4
    x/(x-1)=3/2(x-1)-2
    (n-2)^7-(n+8)*(n-2)^6+(10*n+18)*(n-2)^5-(38*n-6)*(n-2)^4+(68*n-64)*(n-2)^3-(58*n-62)*(n-2)^2+(22*n-15)*(n-2)-3*n=0
    (n)^7-(n+8)*(n)^6+(10*n+18)*(n)^5-(38*n-6)*(n)^4+(68*n-64)*(n)^3-(58*n-62)*(n)^2+(22*n-15)*(n)-3*n=0
    (((x-2)^2-1)*((x-(9-3))*(x-1)-(9-7))+(3-2*(x-2)-(x-2)^2)*(x-1))*((x-2)*(x-1)-1)-((x-2)*(x-1)-1)*(x-2)^2*(x-1)+((x-2)*(x-1)-1)*(x-1)=0
    29.04x^3+371.13x^2-5360.81=0
    (0.24*10^12(t-25*10^-16)-3.1*10^4(t-5*10^-8))^2*2*10^14t-2*10^6=300
    [(6-k)/(k+1)]²＋[(4k)/(k+1)-6]²=(6-2k)²
    x^5-(6+6)*x^4+(8*6+4)*x^3-(20*6-22)*x^2+(16*6-21)*x-3*6=0

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