Task/24101432
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11*C 2x x =6*C 2x +1 x+1 ;
11*(2x)! / x!* (2x -x)! =6*(2x+1)!/ (x+1)!*(2x+1 - x -1)! ;
11*(2x)! / x!* x! =6*(2x+1)!/ (x+1)!*x! ;
11*(2x)! / x! =6*(2x+1)!/ (x+1)! ;
11*(1*2*3*...x) *(x+1)(x+2)...(x+x) / x! =
6*(1*2*3*...(x+1)* (x+2)(x+3) ...(2x+1) / (x+1)! ;
11*x!*(x+1)(x+2)...(x+x) / x! =6*(x+1)!*(x+2)(x+3) ...2x(2x+1) / (x+1)! ;
11(x+1)(x+2)...(x+x)=6(x+2)(x+3) ...2x(2x+1) ;
11(x+1) =6(2x+1) ;
11x+11 =12x +6 ;
x = 5.
ответ : 5