( 5x - 7 ) / ( x - 1 ) = ( 6x - 3 ) / ( x + 1 )
x ≠ 1 ; - 1
( 5x - 7 )( x + 1 ) = ( 6x - 3 )( x - 1 )
5x^2 + 5x - 7x - 7 = 6x^2 - 6x - 3x + 3
5x^2 - 2x - 7 = 6x^2 - 9x + 3
x^2 - 11x + 10 = 0
D = 121 - 40 = 81 = 9^2
x1 = ( 11 + 9 ) : 2 = 10
x2 = ( 11 - 9 ) : 2 = 1 ( не подходит )
Ответ 10