Sagot :
bonjour
6 a + 5 = a + 15
6 a - a = 15 - 5
5 a = 10
a = 10/5 = 2
2 x - 3 = - x + 2
2 x + x = 2 + 3
3 x = 5
x = 5/3
3 b + 3 = 12
3 b = 12 - 3
3 b = 9
b = 9 /3 = 3
Bonjour,
6a + 5 = a + 15
6a - a = 15 - 5
5a = 10
a = 10/5 = 2
2x - 3 = -x + 2
2x + x = 2 + 3
3x = 5
x = 5/3
3(b + 1) = 12
3 * b + 3 * 1 = 12
3b + 3 = 12
3b = 12 - 3
3b = 9
b = 9/3 = 3.