7 3 x 21 4 July 8, 2019 16 32 64 128 7 8 3 14 x 21 4 7 3x 21 4x 7 3 3x 4 21 5 Solve 4 7 x 3 21 3 11x 7 − x 42x 21 3 x 4 )- 21 7 5 x )+ 21x 7 x 9 )+ 21 x 3 )= 406 2 x 3 )/ 7 x 2 13x 4 21 3 4 7 8 x 21 2
