6 5y 7 July 8, 2019 16 32 64 128 6 5y 7 =- 1 5y 6 7y 7y 6 5y 2 6 (- 7 5y )- 9y 5y 6 7y 8 6 7x 5y 6 5y 13 =- 7 3y 6 5y 7 4y 6 5y 7 20x 6 5y 7 2y 5y 6 )= 7y 5y 6 4 7y 4x 5y 6 7x 9y 12 5y 6 2 7y 10 5y 6 2y 7
