Bonjour,
15x - 10a + 25 = 5 (3x - 2a + 5)
14a + 7b - 21 = 7 (2a + b - 3)
ax + ay - 3a = a (x + y - 3)
9ax + 6bx - 15x = 3x (3a + 2b - 5)
5/2ax - 1/2bx + 25/2x = 1/2x (5a b + 25)
32a - 12b + 16 = 4 (8a - 3b + 4)
3ax - 2bx + 5x = x (3a - 2b + 5)
5ax - 15bx - 10x = 5x (a - 3b - 2)
6ax - 9ay - 15a = 3a (2x - 3y - 5)
81 - 9y = - 9 (y - 9).
