Упростите выражение
4/9 * (4 1/2 y - 1 1/2)- 2/7 * ( 1 1/6 - 3 1/2y)

4/9 * ( 4 1/2y - 1 1/2 ) - 2/7 * ( 1 1/6 - 3 1/2y ) = 4/9 * ( 9/2y - 3/2 ) -- 2/7 * ( 7/6 - 7/2y ) = 2y - 2/3 - 1/3 + y = 3y - 1