bonsoir, pouvez vous m'aider a ces 3 équations. merci !!!

Bonsoir,

e. 2 (x - 5) = 3 (- x + 5)
2x - 10 = - 3x + 15
2x + 3x = 15 + 10
5x = 25
x = 25/5
x = 5

f. - (- a + 3) = 5 (3 - a) + 2
a - 3 = 15 - 5a + 2
a + 5a = 15 + 2 + 3
6a = 20
a = 20/6
a = 10/3

g. m - (5 - 2m) = 3m + 4
m - 5 + 2m = 3m + 4
m + 2m - 3m = 4 + 5
0m = 9 --> Impossible