X^2 + X = X * ( X + 1 )
X^2 - X = X * ( X - 1 )
Общий знаменатель = Х * ( X + 1 ) * ( X - 1 ) = X * ( X^2 - 1 )
----------------------------------------------------------------------
16 * ( X - 1 ) - 6 * ( X + 1 ) = X^2 - 1
16X - 16 - 6X - 6 = X^2 - 1
10X - 22 = X^2 - 1
X^2 - 10X + 21 = 0
D = 100 - 84 = 16 ; √ D = 4
X1 = ( 10 + 4 ) : 2 = 7
X2 = 6 : 2 = 3
------------------------------------------------------------------------
X * ( X + 1 ) * ( X - 1 ) ≠ 0
X ≠ 0
X + 1 ≠ 0 ; X ≠ ( - 1 )
X - 1 ≠ 0 ; X ≠ 1
-----------------------------------------------------------------------
ОТВЕТ 7 ; 3