Bonsoir,
Résoudre les équations :
a.
10 - 2x = 5x + 3
10 - 2x + 2x = 5x + 3 + 2x
10 =7x + 3
10 - 2 = 7x + 3 - 3
7 = 7x
7x = 7
x = 7/7 = 1 ✅
b.
2(b - 4) = 11 - b
2b - 8 = 11 - b
2b - 8 + 8 = 11 - b + 8
2b = 19 - b
2b + b = 19 - b + b
3b = 19
b = 19/3 ✅
c.
-11m + 3 = -4(m + 2)
-11m + 3 = -4m - 8
-11m + 3 + 4m = -4m - 8 + 4x
-7m + 3 = -8
-7m + 3 - 3 = -8 - 3
-7m = -11
7m = 11
m = 11/7 ✅
Bonne soirée
