Найдите разность
( 28X^2 - 4X * ( 7X - 7)) / ( 7X - 7) = = (28X^2 - 28X^2 + 28X ) / ( 7X - 7 ) = = 28X / ( 7 * ( X - 1 ) = = 4X / ( X - 1 ) Ответ 4Х / ( Х - 1 )