| (a + 1).b = | (x + 2).y = |
| (3 + a).2 = | (x - 6).z = |
| (5 + 3b).(- 2) = | (- x - 5).y = |
| (- 8) .(b - 2) = | (- a - b).(- x) = |
| (c + 2d).4xy = | (c - 6).(- 8) = |
| (- 3).(a + 5) = | (a - 9b).(- 4x) = |
| (10c - 2).3 = | (z - 16).a= |
| (- y) .(- b - 1) = | 2a.(x - 8) = |
| (7c - 1).a = | (z - 5).e= |
| (- d) .(b - c) = | 2a.(4 + d) = |