bonjour
30
a)
3/4 * x = 5
3/4 * 4/3 * x = 5 * 4/3
x = 20/3
b) 4x - 3 + 3 = 11 + 3
4x = 14
4x/4 = 14/4
x = 3,5
c) 7 - 7 - 8X = 56 - 7
-8x = 49
-8x/(-8) = 49/(-8)
x = -6,125
d) 6x - 4 + 4 = 3x + 14 + 4
6x - 3x = 3x - 3x + 18
3x=18
3x/3 = 18/3
x=6
et e) 9 - 9 - 2x = 11 - 9 + 4x
-2x - 4x = 2 + 4x - 4x
-6x = 2
x = -1/3
31
puisque k(a+b)=ka+kb
on aura
5x-15 - 3x + 7 = 5x-3x-15+7 = 2x-8
et b) 2x-8=9
2x=17
x=8,5
