2x 3 3x 2 9 7 July 8, 2019 16 32 64 128 2x 3 3x 2 9 7 verify 2x 3 (- 4x 5 )= 7 2 3x 9 2x 3 y 9 3x 7 y 2 2x 3 y 9 3x 7 y 2 by substitution method 2x 9
