Bonsoir
0+a = a
1+z = z + 1
0 x e = 0
1 x r = r
t x t = t²
u² x 1 = u²
5 x p x 6 x p = 30p²
2+q x q x q = 2q³
0 x s+d x 1 = d
3+2 x g = 2g + 3
5b x 3 = 15b
3n x 4n = 12n²
3n + 4n = 7n
3a + 4b = 3a + 4b
3a x 4b = 12ab
10n - 3n = 7n
25y - y = 24y
6n x n² = 6n³