A = 3x - 4x + 2x = x (3-4 + 2) = x B = 4t-5tx + 3t = t (4-5x + 3) =t(7-5x) C = 4x - 4y + 4x² = 4(x -y + 2) D = x.x + 3x - 5x.x = x(x + 3-5x) = x(- 4x + 3) E = 3t+ 3x3u + 3x1 = 3(t+3u + 1) F = 3x -1x = x(3-1) = 2x​