15 6 x 5 2 July 8, 2019 16 32 64 128 2 5 13 15 x 6 15 5 2 x 2 6 3 23 5 x 15 6 15xy - 6x + 5y - 2 4 15 5 6 x 2 5 15 6 2 5 x 7 15 5 6 x 10 2 5 5 x 2 15 6 x 2 9 1 2 6 15 x 5 8 1 4 3 6 5 x )+ 15 5 2x 7 15 5 6 9 x 4 x 2 7 X 2 5 equals 6 15