7 - 7x 3 = 21 July 8, 2019 16 32 64 128 7 x 3 )= 7x 21 21x2 3x 7 7x 3 37 (- 2x 5y 7 3 7x 15y 21 21x 2 y 7 7x 3 y 8 )) 5 x 7 = 35 2x 7
