7x 5 y )- 3 9x 2 )- 4xy July 8, 2019 16 32 64 128 5 x 7 = 35 2) (y - 7x ^ 4) - (2 3 - 9x ^ 4) 4) (39n ^ 2 - 2m) + (5m - 44n ^ 2) 9 − 7(x + 3) = 5 − 4x