4y 6 5y 7 July 8, 2019 16 32 64 128 6 5y 7 )= 7 4y 10 4y 7 5y 6 23 4y 5y 6 =- 2y 7 2x 4y 6 3x 5y 7 2 5x 4y 6 7y 5y 6 5 4y 7 5y 4y 7 2y 5y 6 9 6xy - 4y + 6 - 9x