(- 5y 1 3y 2 )=- 9 July 8, 2019 16 32 64 128 (- 2y 2 7y 1 )+( 3y 2 5y 9 2 5y 1 4 3y 9 1/3y+5/9y=7 2 5 9y+2 3y
